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In this video, you can learn how to release the speed limit for Fat tire electric bike DK200. Factory default is 25km/h. After released, it will has no speed limit and the whole power output will be fully released and the speed will go up to 45km/h or even more than 50km/h if the battery is fully charged. If you want the speed to go back to 25km/h to meet local traffic regulations, you can turn off the bike and keep pressing hand lever and hold it and then press the middle button to turn it on. After 10 seconds, release the hand lever. The speed will be restricted to 25km/h.