Swiss manufacturer Stromer has teamed up with Blubrake to integrate an anti-lock braking system (ABS) as part of its speedelec ST5.
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Long-standing standard on cars and compulsory since 2016 on any motorized vehicle with two, three or four wheels with a displacement greater than 125 cm3, can ABS be of interest for electric bikes? Anyone who has ever braked hard and at high speed with an eBike on a wet or slippery surface might be tempted to say yes.
The Swiss brand Stromer has decided to take the gamble by integrating an anti-lock braking system into its high-end urban electric bike Stromer ST5. This model is not a VAE but a speedelec also called a speedbike. This is a category of fast electric bikes with a motor that exceeds 250W (legal limit for VAEs in Europe) and whose assistance allows you to ride up to 45 km / h. They require registration, insurance and compulsory helmet use.
Stromer claims to be the first manufacturer to have integrated ABS directly into the frame of an electric bicycle. The device, supplied by the Italian specialist Blubrake, works on the front 203mm disc brake of the ST5. It consists of a speed sensor on the front wheel which transmits the information to an electronic unit equipped with an inertia sensor which will control the ABS module coupled to the brake master cylinder. The housing and the ABS module are integrated in the upper tube of the frame. The control screen displays information on the triggering of the anti-lock brake system.
850 W electric motor
If the ABS senses that the front wheel stops turning as the bike continues to move forward, it intervenes by modulating the hydraulic pressure of the front brake to prevent the wheel from locking up. It is difficult to assess the efficiency of the system without having been able to try it, even if we imagine that it must work the same way as for a motorcycle.
For the rest, the Stromer ST5 is equipped with a powerful 850 W motor (integrated into the rear hub) which delivers only 48 Nm of torque, which does not bode well for a great nervousness when pedaling. On the other hand, it promises a fairly high range of 180 km with its 48V / 983 Wh battery. You must have a well-stocked bank account to afford this electric bike which costs a trifle of 9,590 euros and will be available from June 2021.
Stromer ST5. © Stromer
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