Need more information. What size is your frame, seat tube center-center? What is your saddle height, BB to seat top? On my bike, it's about 11" vertically from the saddle rails to the rear tire, but my frame is a size 57 cm with 75 cm saddle height, and I'm using Carradice's smallest bag (Barley). The Bagman should keep the seatbag from hitting your tire on a mid to large size frame, but I'm not sure about a small frame.