The 1RC Racing heavy-duty rear axle and compound gear for the 1/18 Midget and Asphalt Sprint Midget uses a metal-injected compound gear in place of the stock aluminum gear for much longer life.
- (1) rear axle assembly with 48T spur gear (0.4M)
- (1) HD 43/13 compound gear (0.4M)
- (1) bearing shim
- 1.38g heavier than the standard 1RC4000