Bicycles

Skarper tech turns bikes into ebikes by powering the brake rotor

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Skarper's DiskDrive unit can be set to different assistance modes, depending on rider preferences
Skarper
Skarper's DiskDrive unit can be set to different assistance modes, depending on rider preferences
Skarper
The DiskDrive can be quickly removed for charging or theft avoidance, or when it's simply not wanted
Skarper

There are now a number of kits for converting regular bikes into ebikes, most of which involve swapping in a motorized wheel or adding a device that rolls against the rear tire. The Skarper system is different, in that it drives the bike's rear brake rotor.

When initially installing the UK-designed setup, users add a wireless cadence sensor to the cranks, they strap a tab onto the non-drive-side chainstay, and they swap the bike's existing rear brake rotor for one that's specific to the system.

From there, it's just a matter of adding the main DiskDrive unit, which hangs off the tab and engages the bottom of the rotor. That unit incorporates the 202-Wh lithium battery, 250-watt motor and other electronics (including a tail light). It can reportedly be "clicked" on or off of the bicycle in just a few seconds – the other components stay on the bike full-time.

The DiskDrive can be quickly removed for charging or theft avoidance, or when it's simply not wanted
Skarper

As its name implies, the DiskDrive augments the rider's pedalling power by driving the rear wheel via the brake rotor, based on cadence and road incline. It's a strategy we've seen before – sort of – in bimotal's Elevate motor module. And yes, the rotor still also stops the bike as needed, even when the drive unit isn't attached.

The Skarper company states that the DiskDrive weighs 3.3 kg (7.3 lb), has a maximum battery range of 60 km (37 mi) per 2.5-hour charge, and delivers a top motor-assisted speed of 25 km/h (16 mph) in the European version or 32 km/h (20 mph) in the North American model.

According to a report on BikeRadar, plans call for the Skarper system to be commercially available sometime next year, at a price of approximately £1,000 (US$1,217). More technical details will likely be available closer to the launch.

You can see it in use, in the following video.

Source: Skarper via BikeRadar

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3 comments
paul314
That's delightful, but you have to really love your existing bike for the price tag to make sense.
PAV
This is a pretty expensive conversion considering the specs. At half that price it may become attractive to someone traveling I suppose. I predict that the sensors and program that determine the grade will fail and I would suggest that they have a wireless throttle rather than a cadence sensor. However if you can have both cadence and throttle that would be even better.
I have experience with the "SmartBikeWheel" and this is the same.
ljaques
I wonder if they'd accept two thousand, or even three, for one of those. It's so, um, optimistic.