 This is a ceramic rear engine bearing from TKO Competition Development designed to fit the Werks Racing Team Line and Sirio off-road competition buggy and truck engines. The bearings have double the RPM capability over steel and reduce friction, rotating mass and vibration. Material specs 52100 bearing steel, poly cage, Cerbec balls grade 3. The bearing dimensions are 14.2mm inner, 25.3mm outer and 6mm thick. This bearing is open to allow oil to lubricate the bearings during use. This bearing will also fit any other .21 to .28 competition engine that uses the same bearing dimensions.
IMPORTANT: Inner race is wider on one side. This faces rear of engine.
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