There are currently a number of kits on the market for converting regular bicycles into electric bicycles, but most of which involve replacing a motorized wheel or adding a device that rubs against the rear wheel. The Skarper system is different, as it drives the rotor on the rear brake disc (the brake disc is Skarper proprietary).
Skarper's investors include six-time Olympic champion and eleven-time world champion Chris Hoy, who was actively involved in testing and developing the unit.

"I have always been an advocate of the need to take more people on bicycles, regardless of their fitness, abilities or age, and I have found that electric bicycles can play a huge role in making cycling more accessible to anyone. And then it is easily disassembled”Explains Chris Hoy.
As the name suggests, the DiskDrive increases the rider's pedaling power by accelerating the rear wheel via the brake disc, based on the cadence and incline of the road. And the disc then naturally behaves like a classic brake disc, so it allows braking and can be used normally without the system installed. Watch the video to understand the goodness of this project.
The Skarper company claims that the DiskDrive weighs 3,3 kg (7,3 lbs), has a maximum battery range of 60 km (37 mi) for 2,5 hours of charge, and offers a maximum motor-assisted speed of 25 km / h (16 mph) in the European version or 32 km / h (20 mph) in the North American model.
A “very powerful” variant for the future
Skarper hasn't revealed all the details, but in addition to the street / urban unit we see here, the brand has also worked with Red Bull Advanced Technologies for an off-road version.

Skarper states that this unit has "an enormous amount of power and abundant torque".
This means that you can hook the system to take it to the top of the mountain, unhook it and store it in your backpack and then you are free to travel the trails with your bike without the weight and additional expenses of an e-mountain bike ".
When will it be available?
According to a report on BikeRadar, plans are for the Skarper system to be commercially available next year (2023), priced at around £ 1.000 (US $ 1.217). More technical details will likely be available closer to launch.
Skarper also claims to be in talks with major bicycle brands for the ability to mount the DiskDrive disc brake rotor as standard.
