Black Caster Blocks for Boost/Circuit/Ruckus/Torment (2) (RPM73442)

RPM Heavy-Duty Black Caster Blocks (two-pack) for 2WD ECX Boost, Circuit, Ruckus, and Torment replace worn caster blocks to help prevent downtime and keep 2WD models running smoothly.

Designed for durability, these blocks feature thicker walls—up to 20%—in key breakage areas and a center rib to increase rigidity, reducing the chance of a hard hit pulling the kingpin screws from the spindle block. Molded from engineering-grade nylon for proven performance, they fit the 2WD Boost, Circuit, Ruckus, and Torment lineup and carry a limited lifetime warranty.