The Street Wheel 23 Tooth Drive Gear Upgrade Kite - Fits Evolve GT, GTX & GTR will give your board EXTREME SPEED. Designed specifically for racing it gives your board a 50KPH top speed depending on wheel size and rider weight. Making it the fastest electric skateboard on the market to date. The wheels shown in the images all fit this drive gear. IMPORTANT NOTE: The use of these drive gears and excessive speed adds extra strain on the board electronics. It is not advised to hold top speed for long periods of time. These gears are meant to be used for short burst to top speed. Along with only riding on flat surfaces. Board Bumpers and Evolve Skateboards are not responsible for damage or injury that may occur from the use of the drive gears . Always periodically check your motor temperatures by touch. If hot let them cool or back off acceleration and top speed boosting until sufficiently cooled. We highly recommend using 90mm and smaller wheels with this drive gear. Always be aware your board could go into thermal shut down. This will cause the loss of brake function. Always make sure you have room to run your speed off in case of board shut down caused by thermal overload protection. ​ Wheel Size Tooth # Speed 83mm Stock 32 36kph 83mm Upgrade 23 50kph Wheels that fit: Stock Evolve Drifter 83mm Wheels Abec11 FlyWheels all sizes - We don't recommend using larger than 97mm wheels Metro Boards Flywheels The drive gear works by trading off acceleration for an increase in top speed. Rider weight and battery charge/voltage affects the achievable top speed. Installation is simple. Just remove your stock drive gears from your wheels and reinstall. 3-6 small supplied spacers may be required for proper fitment. Quality: Our Version 2 drive gears are manufactured out of high strength Nylon plastic. Providing the same level of quality you would expect from Evolve. Items included in order: 2x 23 Tooth Drive Gears 2x Drive Belts 2x Bearings 8x Spacers Item Fits: All GTR, GT Carbon, GT Bamboo, GTX, MAX X1, China Boards and Perfect For Most DIY Builds Disclaimer: Board Bumpers is not responsible for any injury or death caused from the use of our Drive Gears and or Products. Installing this product onto your board increases its top speed and in return increases the chances of injury or death well riding your Evolve GT Electric Skateboard. Purchasing this product releases all liability from Board Bumpers and it's business owners. Using this product is at your own risk. All liability is the purchaser's responsibility. Always wear a helmet and protective equipment well riding your Evolve GT Electric Skateboard. Always remember to ride safe.