Image Item No. Description  45795  Tire 81 x 40 Balloon Offset Tread Catalog: Parts: Wheel, Tire & Tread  50861  Tire 21mm D. x 6mm City Motorcycle Catalog: Parts: Wheel, Tire & Tread  51380  Tire Technic Street Bike (8420) - Narrow, Front Catalog: Parts: Wheel, Tire & Tread  51379  Tire Technic Street Bike (8420) - Wide, Rear Catalog: Parts: Wheel, Tire & Tread