This is a rear bearing from Boca Bearings designed to fit the O.S. MAX .21 RG and .21 VG off-road buggy engine. The bearing dimensions are 12mm inner, 24mm outer and 6mm thick. This bearing is open to allow oil to lubricate the bearings during use. If you run an RG or VG engine, you want one of these bearings to keep the engine running well (the stock bearings do not last very long).
NOTE: This bearing should be installed so that the balls face
the rear of the engine (towards the backplate), in order to allow