A cotter pin is a simple but essential fastener for securing your crank to the spindle on bikes with cotter crank systems. This 9.5mm standard size is a common specification for older road bikes, fixed-gear bikes, and vintage machines. If your crank keeps working loose or you've lost the original pin, this replacement will get you back on the road.
A cotter pin is a simple but essential fastener for securing your crank to the spindle on bikes with cotter crank systems. This 9.5mm standard size is a common specification for older road bikes, fixed-gear bikes, and vintage machines. If your crank keeps working loose or you've lost the original pin, this replacement will get you back on the road.
Cotter pins work by passing through a hole in both the crank and spindle, then spreading the two ends to lock everything in place. They're straightforward to fit if you have a cotter pin puller for removal, though you'll need a hammer and drift to
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