QR Code Link to This Post Bridgestone Mag Mopus G503. Much tread left. Perfect for a late 70's, early 80's bike restoration or any bike using these size tires. Front 3.50 x 19". Rear 4.00 x 18". $125.00 for the pair. Will not sell separately. Call or text. show contact info . Buyer picks up in Altoona, IA.