The Firestone motorcycle tires are an excellent fit for choppers, bobbers, all custom motorcycles and race-inspired bikes using a narrow twenty-one inch front wheel. These Firestone Ribbed 21 inch Motorcycle tires have a straight-groove tread pattern and have a simple sidewall design. These motorcycle tires are a great vintage look for any custom motorcycle with a 21-inch front wheel. Please note that dimensions listed tread width, section width and overall diameter are non-scientific and based on an inflated tire, mounted on a wheel. Dimensions may vary due to rim width and inflation pressure. Grab your tires and get ready to Do Fun SH!T!