Our new heavy-duty rear axle and compound gear ensure longevity with a metal-injected compound gear, replacing the standard aluminum gear used in 1RC4001.
Includes:
(1) Rear axle assembly with 49T spur gear (0.4M)
(1) Compound gear 44/12 (0.4M)
(1) Bearing shim
1.26g heavier versus 1RC4001
