Unfortunately a "matched set" of Metzelers for my bike is as follows. Metzeler - ME 880 Marathon Touring Rear Tire: Size - 170/60R-17 Metzeler - ME 880 Marathon Touring Front Tire: Size - 120/70-21 The rear tire is a radial and the front is a bias-ply. Problem may be my HD Deuce solid rear wheel and my Victory Hammer billet front wheel. They don't seem to like each other. Funny enough, Metzeler says the front tire size is brand specific to a Yamaha XV1900 Star Raider '08. Anyone know if the Radial rear and Bias front will be a problem?