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Instructions for the modification of the FSA 386 crank arm to mount the 26 teeth chainring Instructions for the modification of the FSA 386 crank arm to mount the 26 teeth chainring   On  FSA 386 cranksets Comet - Afterburner - Slk - K Force models to use the chainring 26 teeth, which is the minimum internal, it could be required to reduce of few millimeters the external diameter of the two crank arms, as you can see in the photos below. This small change can be executed by us free of charge, after sending the crank arm at customer cost