Unlike a similar kit made by Canadian manufacturer Envo, the S-Trax does not come standard with a motor. This means that if you don't already have an electric mountain bike with a mid-mount motor, you'll be turning the Crawler's track by muscle power alone. If you do have a mid-motor eMTB, though, a pedaling cadence of 60 to 70 rpm should reportedly be sufficient to maintain a speed of 25 to 30 km/h (16 to 19 mph), in a higher gear ratio. Here I posted it so you will be forced to actually read the article partially first.