Thread in general got me thinking... Is it really necessary to have a cush drive rear hub on a street ridden SM? Last summer I picked up a titled IT465 for the front brake for my YZ250 restoration project. The stock rear hub doesn't have cush drive, but they also ran knobbies on them back in the day. Not near the grip. Wouldn't care if it's hard on chain and sprockets. Hurting the trans would be bad. Good parts are a little scarce.