The fat tires come in two sizes: 20'' Fits Our VTUVIA EBIKES SF20/SF20H/SX20/Kangaroo/FT2-rear tire, excluding the E-Cozy. 26'' Fits Our VTUVIA EBIKES SN100/SJ26/Reindeer/Gemini Note: Tire patterns and brands may vary from batch to batch. Other components not included, such as the inner tube, spokes, rim, disc brake rotor, etc. Please choose the correct tire according to your ebike model. ONLY suitable for our VTUVIA E-Bikes, return, refund, and exchange are NOT acceptable.