Douze Cycles V2 - Speed Booster Shimano STEP - Nuvinci Enviolo hub with Disk brake

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Allows to trick Shimano STEP computer to believe you are going more slowly than you really are and forces the engine to help pedal faster than 25km/h. The ratio between the "Hub Part 1", the "Large Pulley" and the "Magnet Holder" is a ratio of c. 1:1.5 allowing the engine to help pedal tlll 37km/h (but display will show 25km/h when you actually go at 37km/h. You need to print each element only once, except for the "Hub Part 1" that needs to be printed 3 times. Best way to fit the "Hub Part 1" elements is to use tiny string places inside the dedicated grove and make a few turns with it and tie with a knot. The square magnet should be glued using superglue to the "Magnet holder part". Also requires the following items: - 2 very standard 608 ZZ ball bearings - 200x10 mm rubber band (to link "Hub Part" to the "Larger pulley" - 70 x 5mm rubber band (to link the "Large Puley" to the "Magnet Holder" Everything is held together using 5mm bolts and nuts Items printed on Creality Ender 3, PTEG, c. 30% infill Have used it for over 1,000km with no issue (make sure you carry spare rubbers in case one brake (typically last for 300-500km for the long one).