JConcepts Rock Block - green compound, 1.9" (4.19" OD)

JConcepts Rock Block - Green Compound, 1.9" (4.19" OD)

JConcepts introduces the Rock Block tire—an all-condition performer built for serious crawling. Designed by the Adventure Team in Groveland, Florida, these 4.19” tires feature an asymmetrical design marked with L and R for customized setup.

At the center, a multi-faceted tread combines three tread elements. One side features a solid block with a tapered base, notch, and recessed top. The opposite side includes a split block for enhanced flexibility on rough terrain, making them a balanced pair for tough climbs and everyday trails.

Outer lugs zig and zag to enhance grip, while top recesses and wear bars between them tie into detailed sidewall elements. The staggered design helps the tire perform across varying traction surfaces.

The sidewall design progresses in sync with forward motion. Low-height wear bar ribs link everything together for unity during tight climbs. Detailed block cuts and textured extrusions make this one of the most advanced crawler tires from JConcepts.

Each tire includes open cell foam inserts and is packaged with official JConcepts holographic labeling. The popular sticky green compound delivers ideal flex and grip under pressure. Compatible with standard 1.9” bead wheels in plastic, aluminum, or steel.

Features:

• Bold Rock Block asymmetrical design
• Class 1 readiness, 4.19” outer diameter
• Left (L) and Right (R) markings on sidewall
• Fits industry standard 1.9” wheels
• Multi-faceted center tread with 3 block elements
• Recessed lugs and zig-zag tread for enhanced grip
• Retro JConcepts logo with inner hatch pattern
• Connected sidewall lugging and wear bars
• Consistent carcass thickness for a clean profile
• Includes open cell inserts
• Made with JConcepts sticky green compound