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@phospho
Never done this before but I have a single speed with a large chain ring on (52t) running 52/17 which is really tough for me. I want to change to a 46/48 chain ring, but I have no idea how to put it on and don't have all the necessary tools. Would go ahead and buy them myself but really just want to get started and riding somewhat long distances.
My local bike shop charged me £30 to do this job but they did not have a compatible chain ring. I'd be more than happy to pay any one the same price as they charged.
The BCD is 130mm (I think). Will double check when I am home.
Located in E17, so preferably someone close!