Wide Compatibility - This 16 x 2.125 bicycle tire fit for most kids bikes like RoyalBaby, Joystar, Dynacraf, also fit for motorcycle, electric bike, EW36 electric scooter. The diameter of this tire is 16" and the width is 2.125". Please check your original dimensions before purchasing Premium Material - The inner tube of this 16 inch tire is made from premium quality butyl rubber. It's 30% thicker and 480% more elastic and less prone to punctures Excellent Grip- The strip and block pattern design on this bicycle tire greatly increases grip, traction and drainage. Ensuring the safety of traveling on rainy days Retain Air Longer - Our tire with 16x2.125 inner tube equipped with a pure copper air valve like those used by big brands and has a reinforced valve seat. Effectively reduces air leakage and allows the tube to retain air for longer Worry-free Purchase - Before installing, check inner tube for leaks by inflating it then soaking it in water, if there are any bubbles, they are already damaged. Please feel free to connect us, we will try our best to solve the issue 16x2.125 Bike Tire 16 Inch Bicycle Tire and Inner Tube, 54-305 Tire Compatible with Motorcycle Electric Bike, RoyalBaby Joystar Dynacraf Kids Bikes