Rock Block - 1.9" (4.75" OD)

JConcepts Rock Block 1.9" Crawler Tires – 4.75" (Green Compound, 2 pcs.)

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JConcepts Rock Block is an advanced crawler tire developed for serious scale and performance enthusiasts who want maximum traction in all conditions. With an outer diameter of 4.75" and an asymmetrical pattern, Rock Block is perfect for Class 2 trucks and technical terrain where every little contact point counts.

The tire is designed by the JConcepts Adventure Team in Groveland, Florida, and combines a sophisticated pattern, well-thought-out sidewall construction, and the legendary “sticky green” rubber compound – all to give you a tire that works equally well for competition crawling and serious trail driving.

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Asymmetrical pattern – tune the grip to your driving style
Rock Block is built with an asymmetrical pattern so you can mount the tires exactly how you want:

• Each tire is clearly marked with L (Left) and R (Right) on the sidewall
• Allows you to optimize traction and side bite according to your setup
• Ideal for both front and rear axle, where you want to control how the tire behaves in corners and on sidehills

The asymmetrical design makes it easy to fine-tune the vehicle to your specific driving environment – from smooth rock to loose forest floor.

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Advanced center section – combination of three tread types
The center of the tire is built as a multi-faceted 3-tread-element structure that provides both stability and flexibility:

• Solid center block that “drops” slightly downward and becomes a bit wider toward the base
• Small break-away notch and top recess in the block for extra edges and controlled deformation
• On the other half of the centerline: a split block that provides more flexibility and contouring over uneven terrain

The solid and split blocks work together and share the load on steep climbs, sidehills, and technical sections. The result is a tire that feels both stable on straight sections and extremely adaptable on rocks and stones.

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Outer lugs and tread details – grip where you need it most
On the outer part of the tire you’ll find a zig-zag pattern that supports the center structure:

• Outer lugs in a zig-zag shape that help with side grip on sidehills and in corners
• Top recess in the lugs creates extra sharp edges for traction on dry and hard surfaces
• Between the outer ribs there are low wear bars that tie the pattern and sidewall together

The chamfered edges and staggered formations are designed to handle both high- and low-traction sections so the tire doesn’t suddenly let go, but instead provides a more predictable transition when the surface changes.

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Sidewall focused on control and stability
The sidewall on the Rock Block is just as well thought out as the tread itself:

• Momentum-based pattern that follows the direction of travel for better forward stability
• Low wear bar ribs that connect sidewall lugs and help the tire work as one cohesive unit under heavy side loads
• Extra recessed cuts and small extrusions in blocks and sidewall to provide more micro contact points

This combination makes the tire more stable on steep sidehills, narrow passages, and when you wedge the tire between rocks and edges.

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Sticky Green Compound – max grip for crawling
Rock Block comes in JConcepts’ popular “sticky green” compound – a soft and tacky rubber blend that is well known in the crawler community:

• Very high friction on rocks, stone, and wood
• Provides the right amount of flex and “dampen release” so the tire can carry the weight without becoming too mushy
• Helps the tire conform around irregularities for better mechanical grip

This compound is an obvious choice for both competition and serious hobby use, where you want a tire that bites even when things get technical.

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Mounting and compatibility
Rock Block is made for the most common 1.9" crawler wheels on the market:

• Fits: 1.9" beadlock wheels in plastic, aluminum, and steel (industry standard 1.9" bead diameter)
• Class 2 ready with 4.75" (approx. 120 mm) outer diameter – perfect for many popular 1/10 scale crawlers
• Supplied with open cell foam inserts that support the tire without making it too firm

The tires have a continuous carcass thickness that provides a clean profile and predictable deformation, whether you run a light or heavy rig.

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Design and quality details
As always, JConcepts has paid attention to the details:

• Bold Rock Block asymmetrical tread
• Retro JConcepts sidewall logo with inner hatch pattern
• Recessed JConcepts logo and clear marking of tire name and part number (4054 L/R) on the sidewall for easy identification
• Manufactured with high precision and supplied in original JConcepts packaging with holographic badge

The tires are developed, tested, and used by JConcepts’ own team worldwide, so you get a product that both looks truly scale and performs at a high level.

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Features (overview)

• Bold Rock Block asymmetrical design
• Class 2 readiness, 4.75" O.D.
• Left (L) and Right (R) tire marking on sidewall
• Fits industry standard 1.9" diameter wheels
• Multi-faceted 3-tread center structure
• Lug recessing and zig-zag tread combinations
• Retro JConcepts sidewall logo with inner hatch pattern
• Heavy sidewall lugging with continuous wear bar detail for consistency
• Continuous carcass thickness for a clean profile
• Includes open cell foam inserts
• Supplied in JConcepts sticky green compound

With the JConcepts Rock Block you get one of the most sophisticated crawler tires in JConcepts’ line-up – ready for competition, technical climbing, and serious trail driving.