Item Type: DIY Electric Skatingboard Wheel Kit SetGross Weight: 300g / 10.6ozMaterial: Aluminum alloy48T Synchronous Wheel:Pitch: 3mm / 0.1inInner Diameter: 22mm / 0.9inHole Distance Between 2 Holes: 15mm / 0.6inMounting Hole: M4x616T Synchronous Wheel: Tooth Pitch: 3mm / 0.1in, Inner Diameter: 8mm / 0.3inSpeed Ratio: 3:1Synchronous Gear Belt Length: 246mm / 9.7inSynchronous Gear Belt Width: 11mm / 0.4inSynchronous Gear Belt Length: 243mm / 9.6inSynchronous Gear Belt Thickness: 2.4mm / 0.1inApplicable Motor: For 5065, 5055 and other motors with a shaft diameter of 8mm.Package List1 x 48T Gear1 x 16T Gear1 x Timing Pulley Belt1 x Wrench8 x Screw1. Due to manual measurement, please allow errors2. Please confirm whether the aperture of the PU wheel is suitable before purchasing.1High Quality Material: The synchronous gear is made of aluminum alloy, oxidized process, not easy to fade, not easy to rust, durable, stable transmission and high accuracy. 2Prevent Slipping Off: 3:1 gear speed ratio and precise meshing positioning, which can effectively avoid tolerance damage, not easy to slip off during work. 3Good Performance: The pitch of the synchronous pulley belt is 3mm, high quality rubber, high strength, good heat resistance, wear resistance, aging resistance, durable in use. 4Easy Installation: The synchro wheel is easy to install and adjust, saving time and efficiency. Can upgrade your electric skating board. Convenient and practical. 5Applications: Suitable for motors with a shaft diameter of 8mm such as for 5065 and 5055, suitable for PU wheels with a diameter of 70mm, 72mm, 80mm and a width of 52mm, suitable for all kinds of electric skating board DIY.