Here you can find tuning tools especially for electric bikes driven by Shimano Steps E Bike systems. These tuning devices allow you to remove the 15 mph (25 km/h) speed limit and to drive at least twice as fast with full motor power. The tuning tools can be installed very easily and are simple to use. By the way, it is no problem to undo the tuning again. If you are fed up with your electric bikes speed limitation you should order one of these tuning tools to derestrict your electric bike with Shimano motor and with or without electronic Di2.