J Concepts JCO8131

J Concepts JCO8131 RM2 2.2 Hard 2wd | 4wd Rear I

Regular price
Sale price
Regular price
Sold out
Unit price
Shipping calculated at checkout.

JConcepts has upped the ante with the release of the RM2 hard density closed cell inserts. Black in color, these inserts are designed in conjunction with insert gurus Ryan Maifield, Spencer Rivkin, Jason Ruona, and Paul Wynn to bring a firmer feel while providing durability. The inside of the insert has horizontal channels cut in a 360 pattern to soak up the large impacts and help create forward bite and increase acceleration.

The JConcepts design, with custom sculpted features, are blended into the high density material, providing racers a durable option capable of being used in treaded or slick off-road tires in extremely high-traction conditions.


  • Firm density material and construction
  • Versatile size, shape, and profile, fits vast majority of tires
  • Precise contoured manufacturing
  • Durable material, can be reused
  • Black in color for easy identification