The Swiss manufacturer Stromer has partnered with Blubrake to integrate an anti-lock braking system (ABS) as part of its speedelec ST5.
A long-standing standard on cars and mandatory since 2016 on any two-, three- or four-wheel motorized vehicle, can ABS be of interest for electric bicycles? Anyone who has ever braked hard and at high speed on an electric bicycle on a wet or slippery surface might be tempted to answer in the affirmative.
The Swiss brand Stromer has decided to take the gamble by integrating an anti-lock braking system into its top-of-the-line Stromer ST5 urban electric bicycle. This model is not a traditional e-bike, but a speedelec also called a speed e-bike.
It is a category of fast electric bikes with an engine that exceeds 250W (legal limit for e-bikes in Europe) and whose assistance allows to ride up to 45 km/h. Those e-bikes typically require registration, insurance and the mandatory wearing of a helmet.
Stromer claims to be the first manufacturer to have integrated ABS directly into the frame of an electric bicycle. The device, supplied by Italian specialist Blubrake, intervenes on the ST5’s 203mm front disc brake.
It consists of a speed sensor on the front wheel that transmits the information to an electronic box equipped with an inertia sensor that will control the ABS module coupled to the brake master cylinder. The box and the ABS module are integrated in the top tube of the frame. The control screen displays information on the activation of the anti-lock braking system.
If the ABS senses that the front wheel stops spinning while the bicycle continues to move forward, it intervenes by modulating the hydraulic pressure of the front brake to prevent the wheel from locking. It’s difficult to evaluate the system’s effectiveness without trying it out, although it should work the same way as it does on a motorcycle.
As for the rest, the Stromer ST5 is equipped with a powerful 850 W motor (integrated in the rear hub) that delivers only 48 Nm of torque, which does not augur well for nervous pedaling.
On the other hand, it promises a rather high range of 180 km with its 48V/983 Wh battery. You will have to have a bit of savings to buy this electric bike which costs 9.590 euros and will be available from June 2021.
Here is a quick video, introducing Stromer ST5 speed e-bike: