I have KHS aero track with sloping top tube. I can't give you numbers, but I can tell that when a 650 cc wheel is put on; angle get steep, very steep. I put one on to get rid of the pedal overlap, but the drop was way too much. Anyways that wheel is for sale....so if you do decide to switch, let me know. It's used once...24 spoke, radail laced A-class 650cc w/ tire and skewers. Hope that helps.