In the past few years, lighter downhill bikes have been getting below the 40 lbs mark (18 kg).

Frame: The bike's far lighter than your average road bike.

The VX-1 Li is the same as the original bike but using lithium batteries of 30-amp hour capacity, for similar range and performance in a lighter bike.

Thinking at the time was that it was faster to ride a lighter bike with a single gear and no freewheel.

He decided that he needed a lighter bike.

It is a relatively light naked bike with around 53 hp/ 40 kilowatts.

"Not every bicyclist is a He-man with a light bike," he said.

Islabikes is known to produce very light bikes where all components are designed for children.

As Martin Child wrote in Bike, "With lighter, shorter, better-braked bikes on the market, the stoppie has never been so easy for so many."

It's a light bike and you can pedal, but if you need some assistance going up a hill, the power kicks in.