Bike Tires Size: 20 inch bike tire,suitable for wheel diameter: 20 inches,ETRTO:57-406,PSI:35.Suitable for tire: 20 x 1.95/2.1/2.125/2.25 inch. The Bike Tire size is 20x2.125, It can match 20 x 1.95/2.1/ 20 x 2.125/20 x 2.25 inch which will not affect the use effect. lf you mind that the mode is not completely symmetrical, you can choose to buy other exactly the same model. FITS FOR MOST KIDS BIKES - The 20x2.125 bike tire are Universally compatible(for example:Coewske, Royalbaby, Schwinn, Joystar, Dynacraft,etc), you can use these tires on various 20 x 2.125 bike tire. HIGH-QUALITY（BPA/LATEX FREE）&FOLDABLE - Distinct and thick tread for rough riding on different types of surfaces. Made of rubber which make it durable for long lasting use.The bike tire 20x2.125 are safe and can be folded without damage for easy storage.Constructed with premium rubber and nylon cord technology to withstand urban obstacles and gravel paths. All-Terrain Anti-Slip Tread - Features directional knobs and high-drainage grooves to channel away water, sand, and mud. Confidently tackle city streets, mountain trails, and loose sand with superior grip in all weather conditions. EASY INSTALLTION: Easy to mount on the rim. We suggest to replace the both two tires of bicycle.Upgrade your kid’s riding experience with high-quality bmx bike tires that have superior shock, dampening capabilities. 4-Piece Replacement Kit（20x2.125 bicycle tire and tube） - Includes: Two 20×2.125" foldable tires, Two 20×1.75-2.125" foldable tubes,and two professional tire levers. Everything needed for quick tire changes on BMX, MTB, commuter bikes,Cruiser Bikes，E-Bikes,Tricycles. Balinge 20x2.125 Bike Tires 2 Pack 20 Inch Bike Tire Kids Blue 20x2.1 25 Bicycle Tire and Tube Folding Replacement Tire Suitable for BMX Bike 20x1.95 20x2.1 20x2.125 20x2.25,2 Tires+2 Tubes