I own the Cross Check with 700 wheels and Marathon 40mm tires. It can handle off road just fine. I donīt do stunts or bunny hop so canīt talk to that kind of activity but for trails it is just fine and dandy. It is a tad twitchier than my ancient Jamis Diablo mtb with rigid fork and 26 inch knobbies but the Cross Check is much more comfortable on pavement. Itīs a compromise.