Joined: Dec 2004
Posts: 12,537
Likes: 791
From: Middle of da Mitten
Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, Catrike Speed
Oops, I think I looked at it wrong. I think the 'X'es mark the OK combinations not for forbidden ones. But I don't know what the inside width for an Aerohead is - if it's 20mm on the outside, it's certainly less than that on the inside. Depending on the actual inside measurement, a 40mm tire might be allowed or might at least be close.