I've never understood why bike manufacturers don't make it easier to look up parts by serial number. SRAM has done this right, you can search for parts based o

I've never understood why bike manufacturers don't make it easier to look up parts by serial number. SRAM has done this right, you can search for parts based on s/n and it will give you exact specs (s/n is stamped onto the part). Their service manuals are also very well designed and free!