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Shimano Ultegra Cranks & BB30a

TdaytonaTdaytona Posts: 66
edited May 2016 in Road general

My left crank came loose on a ride this morning. There was no warning and the last 3-4mm of the splines a completely ripped. I was wondering if the wider BB could be the problem. Trying to refit when i got home confirms splines are wrecked. The frame is a Cannondale Synapse hi mod, with standard Shimano Ultegra Chainset. I have Rotor BB/Shimano adapter BB, Chain reaction confirmed this was the correct BB for this frame. The bike is a recent build, and only done about 350 miles

I know the Cannondale bike has C1annondale's own crank designed for this BB.

Anyone else have similar issues?


Cheers Paul


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