I hate to post another "what size tire?" thread, but here goes. I'm building up a Surly Cross Check as a commuter that I'll mostly be using on paved MUP and roads (commuting and some long rides). I also plan to ride on gravel roads/trails from time to time. I'm coming from a roadie background so I'm used to 700x23mm. I have 25's on my commuter now. I was planning to go with 700x28mm on the X-Check, but now I'm wondering if I should go for 32's after reading some of the threads here. Watcha think?