Originally Posted by
Iride01
No, typically I expect bicycle tire dimensions to increase the same in over all diameter as the change in width.
Why did your sidewall blow out? At 220 lbs you aren't an issue for bike tires. So perhaps you run too low a pressure or way to high a pressure. Usually low PSI will be snake bites, but damage to the tire casing can be an issue too if the tube is lucky enough to stay out of the way.
I agree! What the OP can do is measure the width of the existing tires and post up a question, "what tire will give me about a millimeter or two more tire/seat tube clearance than this tire, regardless of actual marked size?"
Might also consider having a front deraileur braze-on mount added, to eliminate the issue with the thickness of the clamp. Another thing to consider is that Trek may have intended this lightweight beauty to be set up with 20 to 22 mm tubular tires in the 240 gram or less class. That is a very tightly-built frame!