@Girth Brooks I kind of wish I didn't sell mine, I sold it to make way for a car purchase. The 100V final alarm(80% if power) comes in at 61km/h. The 100V is the one to go for, it will satisfy you speed needs, you will reach great speed quicker. When you exceed 50km/h the headwind becomes greater, you are basically leaning into fierce headwind. Notice from my previous video how easy it was to reach 35mph. Also if you can manage to get the seat and put it on, it increases the height of the wheel, allowing you to also use it as an extension handle and walk it. For reference. I am 185cm in height and weigh 200lbs.