Originally Posted by
mstateglfr
You are running tires that are 30mm right now and have 8mm of space between the tire and contact points, and you think a 45mm tire will fit comfortably?
I would check that math, or maybe you and I have different definitions of 'confortably'.
8mm clearance on all sides, could go 8mm x 2, but that would rub a bit. 32 + 16 = 48mm would rub, 45 is probably safe especially figuring that it will almost certainly inflate smaller. Not saying my math is right, that's just the math I did.
38 seems like a reasonable figure to try. Definitely looking for a slick, not a knobby. I'm liking what I see for Panaracer GravelKing Slick, Rene Herse (Barlow Pass) and also Continental GP 5000 but those only go up to 32. Any recommendations between those or something else? Teravail Rampart is also available in 38, and has the advantage of being the same model that's served me well in 32.