1. can i run compact gearing on a letoy 4 (singlespeed)? compact as in 25-9 2. does pvc work well as spacers if i plan on doing a homemade ss conversion, or would i be better off using aluminum tubing? i have both on hand. 3. does any company make an adaptor to go from manitou brake mounts to IS? i do not want to buy new hopes.