Sky - the frame size is what Trek called a 22.5" frame. According to the geometry chart in the brochure it has a 55.9 cm seat tube and a 56 cm top tube. The brakes are the original Shimano XT-MC70 (the brakes, the headset and the rear rack are the only original parts on the bike). The tires are 35mm and there is definitely room for 38 and i might be able to fit a 40. The fork and the seat stays have room, the clearance would be tight at the chainstays. The bike originally had 27" wheels and i am running 700c on it to give it the extra clearance.
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