The development process saw a number of prototypes constructed. Each mule evolved through tiny but perceptible changes to the frame and set-up to give the 20-inch bike a different set of ...

With disk brakes, 20-inch wheels, seven gears and an aluminium frame, Estarli’s folding e-bike offering ticks all the boxes. The legal maximum for an on-road e-bike motor in the UK is 250W ...