Fit onto you sprocket to reduce the size down to your crank spindle.
Three sizes:
23.8 to 22mm. This goes from 1pc crank size 22mm (Primo etc).
23.8 to 19mm. This goes from 1pc crank size to 19mm (Profile race, etc).
22mm to 19mm. This goes from 22mm (Primo etc) to 19mm (Profile race, etc).
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