Shimano Ultegra SL 6601 Bottom Bracket Cups

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The bottom bracket bearings for the HollowTech II Ultegra SL crankset
Minimal bearing interface gives superbly smooth rolling
Required for installation of the Ultegra SL chainset, with a choice of English or Italian thread BB cups
Set includes left and right hand cups, inner cover and inner O-rings
Sealed cups keep out dirt and water
Maintenance free

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