20 TOOTH SPROKET

i want to put a 20 tooth sproket on the rear of my TOMOS 2007 ST

i know ill have to grind away some of the rear hub for Chain

clearance

can some draw me a diagrame of where and how much has to be ground ?? or a pic would be nice

i dont want to grind away too much

thanks

Re: 20 TOOTH SPROKET

just go a little bit at a time.

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