only on the rear, even though the front wheels are powered as well. On a 2WD or a motorbike, the rear wheel is the only drive wheel, and so putting a paddle tire on the front wheels is useless or worse, since steering performance will be negatively impacted. Paddle tires are available for motocross bikes, all-terrain vehicles, sandrails, and 4 wheel drives. Because the paddles are rigid and stick up several inches, they are not suitable for use on roads or hard terrain, and are not road legal in most places. Often on rear wheel drive quads and dirt bikes specific front sand tires are used in conjunction with rear paddle tires. These front tires are usually called "razorbacks" or simply "ribbed" front tires. The tire carcass overall is smooth with the exception of one to three longitudinal ribs around the circumference of the tire. These ribs are usually about an inch high. This design promotes flotation in the sand due to the smooth part of the tire but also, using the rib to dig into the sand, it provides extra turning force. See also Bar grip tire References Tires