12-1/2″x 2.75″ Options include an inner tube with a straight valve stem & a heavy-duty tube with an angled valve stem Perfect tire for dirt bikes Knobby KF824 tread This 12-1/2″x2.75″ tire with KF824 knobby tread is compatible with the Fit Right FRP DB001 50cc Dirt Bike This tire is also used on the rear tire for the X-Treme X-560 This 12-1/2″x2.75″ tire with KF824 knobby tread is compatible with the Fit Right FRP DB001 50cc Dirt Bike. This tire is also used on the rear tire for the X-Treme X-560. It may also be compatible with other models of scooters and dirt bikes. Because many of our customers prefer using pneumatic tires as they offer a smoother ride than solid or foam-filled tires, we offer this tire with the option of matching inner tubes. You can select the tire alone, or with an inner tube that has a straight Schrader valve stem, or with a heavy-duty, thorn-resistant angled valve stem which makes the job of inflating the tube much less frustrating. Brand: