Totally useless. The internal retraction bolt is too small to be effective. May work with some cranksets but I would NOT recommend buying an ISIS bottom bracket. The pull-bolt diameter was too small and just went through the hollow hub tube (I guess that's what you would call it) of my FSA Pro Carbon Team Issue crankset. It seemed well made enough to use on its own from time to time, but it was useless to me.
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