It can depend on the tire profile. Not all 28mm are equal. I put a pair of 28mm Michelin Axial Sport tires I had hanging around on a MARK V. They sit very high off the rim and there is not enough clearance to mount fenders. They were made in 2001' this model is discontinued. The IRC 30mm tandem tire may fit and is a durable tire for tough conditions. I put some 28mm Rivendell Roly Polies on a Gunnar Street Dog and had to modify some plastic fenders with a heat gun to get enough clearance fwd of the fork. SO IF THERE IS A WILL THERE IS USUALLY A WAY.