At the moment,I run a Schwalbe Fat Frank 26x2.35 on an 80 mm rim. No problems this far,but Frankie has had his best time,so in the near future he will be replaced by a Schwalbe Crazy Bob. At least,that's the plan. Can anybody tell me the width of a fully inflated Crazy Bob? If it's too wide,my plan goes down the drain,because of no chain clearance. Thanx in advance,guys.