I am trying to purchase a new chain and sprockets. Does anyone recommend a manufacturer/supplier that has different ratios, aluminum, and different chain size sprockets for our GSF400M's? I can only seem to find the right teeth with no 520 conversion, the 520 conversion with only higher gearing, or no aluminum, or only the rear sprocket(vortex). Or no one answers my emails that they ask me to send to help them help me. I leave it in your hands.
Andrew