Racers will be very familiar with this style of tread, which takes its inspiration from the Goose Bumps tire. The Rock Bumps competition crawling tire is a pin style 2.2″ with an outer diameter of 5.75″ and is offered in JConcepts’ sticky green compound. Supported by React open-cell foam inserts these tires feature a dense pin array across the carcass mixed with a center “cross” pin, each of which can grab both loose and solid surfaces with authority. The pins do not extend onto the sidewall but rather give way to a dense pattern of shield shaped lugs that offer consistent grip when being used to climb solely with the sidewall.
Item #4072-02 Rock Bumps 2.2″ Competition Rock Crawling Tire https://blog.jconcepts.net/2025/05/jconcepts-new-release-rock-bump-2-2-5-75-od/