mountain bike tires for downhill rides-CeramicSpeed BB - BB90 Trek Shimano Bottom Bracket

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CeramicSpeed Bottom Brackets offer extremely low friction and longer lifetime thanks to the high quality of the CeramicSpeed Bearings that outperform traditionally steel or ceramic bearings used in the cycling industry. Stiff and efficient, this bottom bracket is available fitted with standard or coated bearings. Choosing coated bearings, the bottom bracket is even more resistant to corrosion and has even lower friction than our standard bearings.