for desired torque and top speed. Direct drive motors - placed between the wheels and the trucks and connected directly to the wheels. Board deck Electric skateboards are able to travel at high speeds, as well as go off-road. The stability, in turn, is determined by a couple of key deck features: Length – Achieving high speed almost always requires the use of a longboard. The longer the deck is, the more stable the skateboard will be. Wheelbase – The wheelbase is distance between the front truck and rear truck, with a wider wheelbase providing better weight distribution and stability at speed. Flexibility – Flexibility is the deck's ability to absorb shocks. Greater flexibility has a negative impact on the unit's stability, so downhill racers require stiffer decks. Electronic Speed Controller All electric skateboards need an electronic speed controller (ESC) in order to vary the speed of the motor for accelerating or braking. Originally, hobbyists would typically use ESCs from radio-controlled model cars, but the rise in popularity and interest in building electric skateboards created demand for bespoke and more sophisticated ESCs. The VESC (Variable Electronic Speed Controller) may include motor and battery protection, regenerative braking, programming options e.g. acceleration and deceleration curves, and other advanced features. Truck Trucks are important and extremely durable parts that are mounted under the surface of the electric skateboard. Trucks are part of a T-shaped metal body under the two ends of the skateboard. When choosing trucks, user should choose an axis with the length of 2 closest to the width of the board. The slight difference in width between the skateboard axis and the skateboard surface will greatly affect the time skateboarding. To have a safe and accurate way to buy skateboards, you just need to pay attention "the bigger the surface of the board, the bigger the axis of the board." Safety Typical retail boards such as those from Evolve and Boosted are able to reach top speeds of around 20-25mph (32-40kph) on their fastest modes, while specialist and hobbyist boards can be built with very powerful motors for top speeds of 50mph (80kph) and beyond. Braking is typically implemented as Dynamic braking / Regenerative braking from the rear wheels only and the stopping distance can vary widely between motors and wheels/tyres. There have been several fatal accidents involving electric skateboards and many accounts of hospital visits. Personal protective equipment including helmet,