- Aug 23, 2009
I can run 700x32mm in my disc brake bike. I have ridden my CX bike on single track without issue, so I feel ok with 32mm. But I noticed the gravel crowd often run bigger... 40mm+. I think I could fit a 650b with 38mm~40mm. My question is if it makes that much difference between 32mm and 38mm for Japanese off-road as I would prefer to stay with 700c? Thanks...