Eastern Motorcycle Parts Bearing — mainshaft bearing for 5-speed Big Twins, open end

Replacement mainshaft bearing for 5-speed Big Twins. This precision component restores smooth gear engagement and reduces play in the transmission mainshaft.

Engineered for reliable fitment, the bearing offers consistent performance under load. For best results, inspect mating surfaces and seals before installation, apply appropriate lubricant to the shaft, and follow factory assembly procedures.