I have read about some having trouble with the drive chain rubbing the frame. I wasnt having the problem until today I noticed a slight rubbing. (I still have the stock chain) I recently discovered I was keeping my chain to tight (I was using the 3 finger rule) and I adjusted it to the prescribed 2+/- inches. I adjusted the wheel and measured and remeasured and all seemed within specs. My real question is has anyone seen any kind of chafe guard for the frame??? I seem to recall GrayRacer talking about designing one.