12-1/2" x 2-1/4" scooter inner tube. Extra thick walled tube with straight valve stem. Thorn and puncture resistant (but not proof!). Compatible on all all 12-1/2" size tires with widths of 2.0-3.0".
these tubes are stout! Ordered for a golf push cart, and the size is right, but the tubes are so stout you almost have to over inflate it to get the tube to touch the tire on the inside. I'll be increasing the pressure here. Love the quality tho.