CeramicSpeed PF4630 Bottom Bracket - Red CoatedSpecification Fits 30mm thru axle cranks with 46mm inner diameter shells; extended cups and telescoping spacer tube enhance stiffness and sealing. CeramicSpeed Bearings with hardened steel races offer excellent stiffness and durability for long lasting performance. Standard bearings deliver just 0. 30. 4 watts of draga 75% reduction compared to conventional bottom brackets. Bearings last at least 3 times longer than standard options, thanks to premium
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