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Converting trek 1000 53/39 to a ?

JimmyKJimmyK Posts: 712
edited October 2009 in Workshop
rear cassettte is 8 speed shimano 12-25 and shifters are sora.i need some lower gears and id like to add a 3rd front chain ring like a 30, would this be possible , if so, what parts would I need to get and would it be costly ? obviously be a LBS job



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