This is a Protek R/C Ceramic 13x25x6mm "Speed" Rear Engine Bearing, and is intended for use with the O.S. RZ-V01b, RB S7/WS7/WS7II, and Novarossi N21B/T21BF off-road competition engines as well as any other engine that requires a 13x25x6mm rear bearing. The bearing dimensions are 13mm inner, 25mm outer and 6mm thick. This bearing is open to allow oil to lubricate the bearings during use, and the ceramic balls ride on a polymide race. If your engine starts making loud bearing noises at idle, you probably want one of these bearings to keep the engine running well.
Why Ceramic?Our ProTek Ceramic Engine Bearings are a hybrid type, featuring Stainless Steel outer races with Si3N4 silicone nitride ceramic balls riding on a polymide inner race. Ceramic bearings have many advantages over standard steel bearings, such as decreased weight, higher RPM capabilities, increased corrosion and wear resistance, as well as reduced friction and vibration.
So next time you purchase a engine bearing, when you ask yourself "Why should I buy Ceramic?" You should be asking yourself "Why shouldn't I?"
Advantages of Ceramic:
NOTE: This bearing should be installed so that the balls face the rear of the engine (towards the backplate), in order to allow proper lubrication.