CG125 motorcycle needle roller bearing and deep groove ball engine bearing, the size and CG125 engine rocker arm, variable speed mechanism bearing fully match, directly replace the original needle roller bearing, without adjusting the installation position; The needle roller structure has large contact area, carrying capacity is 30% higher than the ball bearing of the same size, and the friction coefficient is small, reducing the power loss; Needle roller + inner and outer ring are quenched with bearing steel, hardness up to HRC60+, suitable for high-frequency reciprocating/rotating conditions, long service life; Deep groove ball structure + P0 level precision, small running clearance, low mechanical noise, improve the ride comfort of the transmission system; With sealing cover, prevent dust/oil impurities into, reduce grease loss, suitable for complex working conditions; Bearing steel quality after quenching treatment, can withstand the engine high speed running load, to avoid fragmentation fault.