How to Remove and Install a Crank | Park Tool
https://www.parktool.com/blog/repair-help/how-to-remove-and-install-a-crank
Sep 09, 2015 · Cranks are levers that connect the pedals to the bottom bracket spindle. The cranks are fitted with toothed sprockets called chainrings that drive the chain. Cranks may be removed to replace cranks or chainrings, service the bottom bracket bearings, or to clean the …
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