Widely Suitable: 12-1/2" x 2-1/4" Tire and Tube Kit Fits RoyalBaby, Joystar, Dynacraft and Electric Scooters, Kids Bike & Balance Bike Tube fits most 12-inch wheel scooters and vehicles, such as e-bike, mini cross machine, mini dirt bike, kids motorcycle, balance bike High Quality: 12.5 x 2.25 Kids Bike Tire & Inner Tube Set is made of high-quality butyl rubber with better stretchability and shock absorption, allowing you to ride more smoothly and comfortably. And it also has better impact resistance and puncture resistance, is not easy to be damaged, and can be used for a long time Unobstructed Ride: The surface of the tire uses a large number of sipes,an abundance of these sipes ensures efficient water dispersion and wet performance and enhances traction on slippery surfaces.Rides unobstructed on wet surfaces even after rain New Upgrades: The tube's straight stem features an enhanced seat seal to prevent sand and dust from entering the tube and tire. The tough rubber stem seat is also tear-resistant, extending the service life of the valve and ensuring that the inner tube does not leak for a long time Packing Include: 2*12 1/2*2 1/4 tire + 2*12 1/2x2 1/4 inner tube + 2*valve valve cores + 1*valve core wrench +2*aluminum alloy colored valve cap 1