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Your cart is empty.Shimano bottom bracket O-ring helps seal the bottom bracket from the elements.
J. Wu
Reviewed in the United States on May 11, 2017
it's Shimano.
Bart
Reviewed in the United States on August 5, 2014
I thought it was a shim, but I was wrong. It's literally an o ring that pops into the ultegra 6800 crank arm. If you need shims, search for the wheels manufacturing bottom bracket shim.
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