I managed to mangle the larger chainring on my crankset. When I took it to the shop the guy said that his measuring tool didn’t even go big enough to figure out the chainring size. Can anyone ID this crankset? It comes from a 1980 Norco bike. On the back of the crank arm it says ‘Sugino Forged Japan 170’ and there’s also a little icon that says J12. Other than that there are no other identifying markings that I can find. I was hoping to just replace the one chain ring but maybe that won’t be possible. Thanks!
by StefanTheLawn