Rocky Terrain Tire Performance

Pneumatic vehicle tire with optimized shoulder performance and traction on soft ground. The tire has a tread with shoulder-side profile ribs that have rectangular depressions in the outer shoulder region. The depressions have base portions that taper from a shorter inner portion to a longer outer portion. The outer base portion ends in a flank that angles 80-100 degrees with the shoulder face. This tapering shape reduces rubber in the shoulder while maintaining grip. The depressions improve off-road traction by optimizing shoulder pressure distribution.

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Off-road tire with improved traction in multiple directions by using inclined recessed blocks in the centerland between the main grooves. The centerland is sectioned into four blocks by the lateral and longitudinal grooves. Each block has a recessed portion open to a main, lateral, or longitudinal groove. The recessed portions have a width of 5 mm or more. The blocks are angled in opposite directions to provide traction in multiple directions. This improves traction by allowing the recessed blocks to bite into different angles of terrain.

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Pneumatic tire design for improved noise and off-road performance. The tire has a unique bent main groove pattern that provides better starting traction and edge effect on unpaved roads. The bent elements formed by connecting at least 5 linear grooves have 3+ types of inclination angles and 5+ types of lengths. This complex bent shape improves the edge effect by increasing the amount of ground contact when turning. The tire also has features like sipes, narrow grooves, and crossing groove groups to further enhance off-road performance.

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Pneumatic tire design to prevent stone drilling and tread separation without complex projections. The circumferential main grooves have a zigzag shape with alternating wider and narrower sections. The narrower sections on the outer side of the tire should be smaller than the narrower sections on the inner side, with a ratio of 0.15 to 0.60. This prevents stones from getting stuck in the narrow sections and biting into the tire. It also prevents belt damage from stones entering the narrow sections. The zigzag shape with mismatched narrow sections provides stone deflection. The wider sections on the outer side should be smaller than the inner side, with a ratio of 0.005 to 0.03 in tire circumferential length. This prevents tread separation by minimizing edge cracking from stones. The zigzag shape and mismatched narrow sections allow the tire

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Pneumatic tire with improved off-road performance. The tire has center blocks with stepped grooves that extend diagonally across the blocks. The steps create see-through sections and wider sections. This balance of openings and expansions allows the blocks to bite into soft terrain while also shedding mud. The steps are angled within certain limits for optimal performance. The tire also has center blocks extending beyond the equator to provide more edge effect. The steps in the diagonally inclined grooves provide a well-balanced combination of shear force and mud shedding. The tire's design strikes a balance between edge components in the circumferential and lateral directions for improved off-road traction.

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A pneumatic tire design with improved off-road performance by balancing traction and mud shedding. The tire has main grooves on the left and right sides that extend continuously around the circumference. There is no main groove between them in the axial direction. This configuration allows the tire to generate good traction on rough terrain while also improving mud shedding compared to having a full circumference groove between the main grooves.

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A pneumatic tire for off-road driving that balances traction on loose terrain with cut resistance. The tire has alternating inner and outer shoulder blocks with grooves between them. Protrusions extend from the groove bottoms on the outer side of the inner blocks. These protrusions have narrow sections near the inner blocks and wider sections farther out. The wider sections provide traction on loose terrain while preventing rocks from entering the grooves and damaging the inner blocks.

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Tire for off-road vehicles that improves traction on rough terrain. The tire has a tread with blocks raised from the base. The blocks have a specific pattern and configuration for the intended tire rotation direction. This optimized block design enhances traction and power when the tire is mounted and rotated according to the intended direction.

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Tire design to prevent stone drilling in heavy duty tires like waste collection vehicle tires. The tire has a unique block shape with inner grooves that project inward. The blocks have bent main grooves with changing wall angles. In adjacent blocks, the inner groove projections have wider angles on one side compared to the other. This prevents stones caught in the inner grooves from drilling into the tire because the wider angles push stones back out when the tire contacts the road. The inner groove projections on one side of the main groove bend have smaller angles, making it easier for stones to escape.

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Tire with improved stone biting resistance by optimizing the groove geometry. The tire has a tread with zigzag circumferential grooves that have intersections where the zigzag elements meet. The grooves have protrusions connecting the walls and protrusions at the intersections. These protrusions project outward in the radial direction. The zigzag groove pattern and protrusions enhance stone release when the tire contacts irregular road surfaces like stones. The protrusions prevent stones from being wedged between the groove walls, reducing stone retention and biting.

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Pneumatic tire with improved traction and cut resistance for off-road applications. The tire has a block pattern on the shoulder and side regions. The blocks have contour lines extending along the grooves that are aligned on the same line. This prevents misalignment and improves traction by efficiently discharging mud. The blocks also have tapered shapes with straight and inclined portions at the top. This avoids stress concentration and improves cut resistance. The blocks also have protrusions on the groove bottoms that extend in line. This improves stone catching and soil discharge.

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A spring tire for off-road vehicles like lunar rovers that uses shape memory alloys (SMAs) in the tire and bump stops to provide improved load carrying capacity, flotation, climbing, and traction compared to conventional spring tires. The tire has a main body with SMA radial elements, an inner bump stop assembly with SMA elements, and integrated tread lugs. The SMA elements allow variable stiffness and deflection for better ground contact and climbing. The bump stop engages early to prevent excessive deflection. The tread lugs form from alternating stiffness elements. The tire also has natural damping from the large number of SMA contact points.

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Rubber compositions for off-road tires, tracks, and belts that balance resistance to mechanical attacks and hysteresis. The compositions contain an elastomer matrix with predominantly isoprene rubber, reinforcing filler, cellulose pulp, and a crosslinking system. The cellulose pulp length is 1.1 to 4.9 mm and diameter 1 to 40 µm. This pulp size range provides a balance between stiffness and anisotropy for improved attack resistance and hysteresis compared to shorter or longer pulp. The compositions can have isoprene rubber contents up to 100 phr, cellulose pulp contents up to 20 phr, and carbon black BET surface areas above 90 m2/g.

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Heavy duty tire tread design for improved grip and reduced crown temperatures in harsh off-road applications like construction vehicles. The tread has five rows of blocks separated by alternating longitudinal grooves and transverse cuts. The inner longitudinal grooves connect adjacent rows to allow longitudinal mud/water discharge. This promotes grip and reduces mud buildup. The tread also has ventilation cavities between blocks in lateral rows that open into the sidewall. This allows sidewall cooling to prevent crown damage. The design balances grip, mud discharge, and cooling to improve tire performance and durability in challenging off-road conditions.

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Pneumatic tire with improved off-road performance and damage resistance. The tire has center blocks with cuts that have angled walls extending in different directions. The cuts have larger angles than the walls of the surrounding block. This provides biting edges for off-road traction while maintaining block rigidity and preventing excessive damage. The tire also has opposing center blocks extending across the equator and inclined shoulder grooves with opposite inclinations. This allows mud and stones to flow into the cuts for better off-road grip. The blocks have shallow sipe ends for traction without rigidity loss.

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Tire with improved off-road performance by optimizing the tread compound and geometry. The tire has a cap rubber layer with specific rubber composition and thickness. The cap rubber contains 40-80% SBR with 25% styrene or less, 60% filler or more, and a glass transition temperature (Tg) of -40°C or lower. The Tg and groove depth satisfy a relationship. This compound allows efficient compaction and discharge of soil. The cap rubber thickness is at least 10% of the tread. This setup improves soil discharge, chipping resistance, and off-road traction compared to conventional tires.

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Pneumatic tire for off-road vehicles with enhanced traction, cut resistance, and uniformity. The tire has L-shaped side blocks with overlapping circumferential and radial portions that form side block pairs. These pairs are arranged around the tire circumference. The L-shaped side blocks have protruding hooks that extend from the shoulder region into the side region. This provides additional recesses and protrusions for better traction on rough terrain while preventing foreign object damage. The overlapping blocks maintain uniformity by balancing rigidity.

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Pneumatic tires for off-road vehicles that provide enhanced traction and grip on uneven terrain. The tire has alternating tread patterns around the circumference with lands extending from the tread. The lands have sidewall portions that protrude from the tire sides. One land is on the first side of the tread equator and the other land is on the second side. This configuration provides increased ground contact and grip on rough terrain compared to a conventional tire with a single land pattern.

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Tire design with improved off-road performance and noise reduction. The tire has shoulder land grooves with specific geometry. The outer groove portion has a wider width that increases outwardly from the tread edge. The inner groove portion has a constant width. This configuration provides better off-road traction and stability. The wider outer groove helps grip in loose terrain. The constant width inner groove prevents excessive deformation. The shoulder circumferential grooves have curved projections that extend into the shoulder land grooves. The tire also has intermediate position width ratios that decrease outwardly. This reduces noise. The shoulder land grooves have communicating links between the outer and inner grooves near the tread edge.

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Tire capable of improving off-road traction performance while suppressing an excessive decrease in the anti-wear performance. The tire includes a pair of shoulder main grooves, a crown region defined between the pair of the shoulder main grooves, and a pair of shoulder regions arranged on both outer sides of the pair of the shoulder main grooves.

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Tire capable of improving stone biting resistance. The tire includes a tread portion which is provided with a plurality of circumferential grooves extending in a zigzag manner in the tire circumferential direction, and land portions demarcated by the circumferential grooves.

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Off-road pneumatic tire that improves running performance of a tire, desirably, a traction effect by biting mud and rocks on a road surface. The tire includes a pair of main grooves extending along a tire circumferential direction, lateral grooves which couple the pair of main grooves to each other, longitudinal grooves which couple, to each other, the lateral grooves adjacent to each other in the tire circumferential direction and a plurality of center blocks sectioned by the main grooves, the lateral grooves and the longitudinal grooves.

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Tire that improves traction performance on rough terrain. The tire includes a block for running on rough terrain that has a ground contacting top surface having a heel-side edge, a heel-side side wall surface extending radially inwardly from the heel-side edge while inclining toward the toe side in the tire rotation direction, and a length in the tire radial direction of the radially outer portion is in a range from 30% to 70% of a height of the block measured in the tire radial direction from the ground contacting top surface to the tread base portion.

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Tire that can run on an uneven road surface such as muddy roads or rocky terrain. The tire includes a tread portion and a pair of sidewall portions each extending inwardly in a tire radial direction from the tread portion, wherein at least one of the pair of the sidewall portions is provided with at least one side protector protruding outwardly in a tire axial direction, and the side protector is provided with a groove, a cut-out portion connected with the groove, and a sipe connected with the groove.

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Tire capable of improving off-road traction performance while suppressing an excessive decrease in the anti-wear performance by improving shapes of the sipes. The tire includes a tread portion, wherein the tread portion includes a pair of shoulder main grooves and a crown region defined between the pair of the shoulder main grooves, the crown region includes a plurality of crown blocks, a ground contacting surface of at least one of the crown blocks is provided with a first sipe, a second sipe, and a third sipe, and the first sipe, the second sipe, and the third sipe are connected with each other at one intersection.

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Tire capable of improving driving performance on off-road such as snowy and muddy roads. The tyre includes a tread portion including a shoulder land portion, the shoulder land portion having a tread edge and an outer surface in a tyre axial direction extending inwardly in a tyre radial direction from the tread edge, the shoulder land portion being provided with shoulder lateral grooves extending inwardly in the tyre axial direction from the tread edge to define shoulder blocks therebetween, and protrusions protruding outwardly in the tyre axial direction from the outer surface of the shoulder land portion, the protrusion including first protrusions each provided on the shoulder blocks and extending in the tyre radial direction, and second protrusions connecting inner ends in the tyre radial direction of adjacent two first protrusions in a tyre circumferential direction such that first bent portions are formed between the second protrusions and the first protrusions.

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Tire capable of improving off-road traction performance while maintaining anti-wear performance. The tire includes a pair of shoulder main grooves which are disposed to continuously extend the sides closest to tread ground ends in a tire circumferential direction and clamp a tire equator, a crown region between the pair of shoulder main grooves, and shoulder regions disposed outside of the shoulder main grooves in a tire axial direction; land ratios of the crown region and the shoulder regions are respectively 40%-60%; in the crown region, a plurality of middle blocks are arranged on both sides of the tire equator; and each middle block has a longitudinal shape in which a length L2 in the tire circumferential direction is larger than a length L1 in the tire axial direction.

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A pneumatic tire with improved traction on sidewalls for better performance on snow, mud, and rough roads. The tire has projections called annular projections, buttress blocks, and side blocks on the sidewall. These projections provide traction by resisting shearing of snow, mud, or sand, as well as by contact friction with rocks or other obstacles. The projections on the sidewall enhance grip compared to a smooth sidewall, especially in challenging driving conditions like snowy roads or off-road terrain.

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Tire capable of continuously exerting good traction performance on rough terrain. The tire comprises a block row and a head of each side wall surface in a longitudinally directed manner to facilitate discharge of soil and mud in the lateral grooves when running on rough terrain.

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Vehicle tire having an off-road tread profile with radially elevated profile elements, separated by circumferential channels extending over the circumference of the vehicle tire, and with transversely running channels which open into circumferential channels. The tire includes a central body formed with a height HZ and two webs formed with a maximum height HS in the intersection contour with the central body.

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Radial tire for heavy-duty vehicles with improved resistance to tread separation when running over sharp objects like rocks. The tire has a reinforced crown with three layers of protective reinforcement sandwiched between the tread and carcass. The innermost layer has elastic metal reinforcers angled at 60-75 degrees to the tire circumference. The middle layer has the same reinforcer angle. The outer layer has reinforcers angled at 50-60 degrees. The innermost layer width is 105-125% of the tread width to protect it. The layer spacing and reinforcer diameters are optimized for balance between tread deformation and cracking resistance.

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Tire design with interlinked springs to improve off-road performance by preventing sand and debris ingress into the wheel and avoiding wheel burial. The tire has a skeleton with multiple body springs attached to the rim and interlinked springs interwoven between them. This closed spring network prevents sand and debris from entering the wheel through gaps between coil springs. It also prevents wheel burial in loose terrain compared to open wheel designs with coil springs. The tread is on the outer perimeter of the skeleton.

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Stone ejector provided on a groove bottom surface of a tire such as an off-road tire to prevent damage to the groove bottom surface caused by a caught stone, and to easily discharge a caught stone to the outside of the groove. The stone ejector includes a main body, and an end portion provided on at least one side in a longitudinal direction of the main body, and shaped such that a height of the protrusion from the groove bottom surface decreases from an inside to an outside in the longitudinal direction of the main body.

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Pneumatic tire with improved protection and decoration of the sidewall buttress area when traveling on punishing roads like mud and rocks. The tire has lug grooves that compartmentalize the buttress block into outer and inner sections. An annular rib extends around the buttress block in the sidewall. To enhance protection and reduce visibility of the rib, widened portions are added to the lug grooves where they intersect the rib. This makes the annular rib more rigid and less conspicuous. It also provides better puncture resistance and prevents damage to the sidewall from protruding road objects.

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A pneumatic tire with improved traction performance and reduced rigidity variation in the sidewall. The tire has asymmetric side block designs with different outer edge shapes. The side blocks have an inner portion and an outer portion. The outer portions have annular protrusions that extend further outward compared to the inner portions. This asymmetry allows better traction on uneven terrain like mud, sand, and rocks compared to symmetric side blocks. The outer edges of the annular protrusions also provide a wider contact area for better traction. The asymmetric side blocks balance the need for improved traction with reduced variation in sidewall rigidity compared to symmetric side blocks.

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Tire of which off-road performance is improved by improving the mud ejecting performance from their junction positions. The tire comprises shoulder main grooves and shoulder axial grooves extending from the shoulder main grooves to the tread edges. The shoulders are zigzag in a trapezoidal wave form.

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Tire capable of exerting excellent off-road performance and noise performance. The tire includes a tread portion comprising at least two main grooves extending continuously in a tire circumferential direction, wherein the first main groove comprises a first oblique portion inclined with respect to the tire circumferential direction and a second oblique portion connected with the first oblique portion and inclined in an opposite direction to the first oblique portion, and the second main groove comprises a third oblique portion inclined in a same direction as the first oblique portion with respect to the tire circumferential direction, a fourth oblique portion inclined in an opposite direction to the third oblique portion, and a longitudinal groove portion disposed between the first oblique portion and the second oblique portion so that they are not directly connected and extending along the tire circumferential direction.

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Pneumatic tire that enhances driving performance on a punishing road such as a muddy ground and a rocky stretch. The tire has a concavo-convex shape that can be formed by a step corresponding to an annular rib and easily bite the mud. The tire includes a sidewall portion, a bead portion, a tread portion, and a sidewall portion.

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The pneumatic tire assembly includes a tread portion including one or more traction features, a first sidewall portion coupled to the tread portion, and a first bead portion coupled to the first sidewall portion. The tread portion includes many edge components to provide the grip/bite necessary to maintain traction while preventing mud/snow from clogging the tread pattern.

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Tyre that suppresses cuts on the sidewall portions due to contact with rocks and the like when off-road traveling. The tyre includes a tread portion, and a pair of buttress portions each extending inwardly in a tyre radial direction from a respective one of tread edges.

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Pneumatic tire for improved off-road performance by optimizing the lateral groove pattern. The tire has continuous lateral groove groups extending across the tread width from side to side. These groups consist of interleaved narrow grooves (sipes) and wider grooves. The sipe-narrow groove alternation complicates the groove shape and enhances off-road traction compared to discontinuous groups. The continuous grooves start from the side blocks, connect to shoulder blocks, and extend across center blocks. This provides enhanced startability, traction, and stability on unpaved roads.

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Tire capable of improving traveling performance on rocky terrain. The tire includes a shoulder block row including a plurality of circumferentially arranged shoulder blocks on at least one side of tread edges, the shoulder blocks including a first shoulder block and a second shoulder block alternately arranged in a circumferential direction of the tire, the first shoulder block including a first edge defining an axially outermost ground contact edge of its ground contact surface, and the second shoulder block including a second edge defining an axially outermost ground contact edge of its ground contact surface, the second edge being located axially inwardly of the first edge.

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Vehicle tyre that allows the design of such vehicle tyres utilizing the advantages of shallow grooves, in particular for off-road usage of utility vehicle tyres, while reducing the potential for crack formation. The tyre includes profiles elements which are separated from one another by channels and are delimited radially outwardly by a radially outer surface, and additional shallow grooves which are formed in the radially outer surface of profile elements and are delimited inwardly in the radial direction by a groove base, and are formed with decreasing depth along the extent of the groove, starting from a position of the greatest depth of the groove to the extent end of the groove pointing away from the deepest point.

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Tire capable of exerting excellent grip performance on a rocky road surface or a snowy/muddy road surface while maintaining the durability of the blocks. The tire includes a tread portion, wherein the tread portion includes a pair of shoulder main grooves and a plurality of crown blocks formed between the pair of the shoulder main grooves, each of the crown blocks includes a ground contacting surface, a chamfered portion arranged so as to surround the entire circumference of the ground contacting surface, and a main body portion arranged inside the chamfered portion in a tire radial direction, and the main body portion is provided with at least one step-shaped portion that is bent stepwise in a transverse cross section orthogonal to the ground contacting surface.

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A pneumatic tire design for improved traction and cut resistance on unpaved roads, particularly rocky terrain. The tire has side blocks with recessed steps on the side closer to the groove and raised bottoms that couple the blocks. This shape provides enhanced rock performance while preventing groove bottom damage and maintaining cut resistance. The side blocks have a recess/protrusion shape with a reference surface closer to the groove and a stepped surface further out raised above it. The grooves have raised bottoms connecting the blocks. This shape allows better biting into mud/rocks while preventing stone entrainment and groove damage.

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A tire design with improved resistance to damage from indenting objects like rocks. The tire has a crown reinforcement between the carcass and tread. The crown reinforcement has a protective reinforcement layer with plies having higher break force than the working plies closer to the tread. This indirectly reinforces the working plies against indentation without increasing their stiffness as much. The protective plies transfer load to the working plies before they break, preventing separation at the edges. The ratio of break force between the protective and working plies is 0.27 or higher.

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Tire with superior driving performance on muddy ground, snowy roads, sandy land, and the like. The tire includes a tread portion extending in a tire circumferential direction to form an annular shape, a pair of sidewall portions disposed on both sides of the tread portion, a pair of bead portions disposed inward in a tire radial direction of the sidewall portions, main grooves disposed in shoulder regions of the tread portion and extending in the tire circumferential direction; a plurality of lug grooves extending outward in a tire width direction from the main grooves and reaching the sidewall portions; and a plurality of blocks partitioned by the main grooves and the lug grooves.

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Tire design to improve off-road traction without sacrificing wear resistance. The tire has sipes on the ground contacting surfaces of the blocks in the crown region between the shoulder main grooves. The sipes, called first, second, and third sipes, are connected at an intersection. This configuration improves ground contact for off-road traction without excessive decreasing wear performance compared to just having sipes. The sipes connect to the edges of the block surface and divide it into three sections.

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Tire capable of improving off-road traction performance while suppressing an excessive decrease in the anti-wear performance. The tire includes a pair of shoulder main grooves, a crown region defined between the pair of the shoulder main grooves, and a pair of shoulder regions arranged on both outer sides of the pair of the shoulder main grooves.

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Pneumatic tire with improved off-road performance by optimizing the sidewall design. The tire has sidewall protectors with angled grooves on at least one sidewall. The grooves have inclined sections that change direction relative to the tire radial direction. This angled groove shape provides better traction and grip on uneven terrain compared to conventional straight sidewall grooves. The inclined sections also help prevent damage to the sidewall from rocks and debris.

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