Enjoy! FYI, I spend most of my time on 40mm tires. Unless you are racing in an internationally certified event (UCI), no one typically really cares. Shoot, the last race I put a 50mm tire on. All depends on what your frame will take, but do yourself a favor and don't limit yourself to 33mm tires. Hopefully USA Cycling and/or UCI will do away with that out dated 33mm rule (Kinda made sense with Canit bikes, but its kinda silly to limit a disk braked bike to 33).