The fact that eMTBs weigh up to double that of their all-mountain counterparts is not the only issue that places a higher demand on braking components. EMTB's carry more speed everywhere and riders find themselves braking more frequently - even for uphill situations. That puts a lot of heat into the rotors and calipers, in addition to accelerated wear. Magura joins other top brake makers with two eMTB specific braking systems.
They're called "eSTOP" brakes and are based upon their existing 4-piston MT5 and 2-piston MT4 platforms, but Magura beefs up the stopping performance with their "Sport" brake pad material and two new rotors. The lower spec rotor is reinforced in the center section to ward off warping and to act as a heat sink.
The big news, however, is Magura's two-component MDR-P rotor. It's braking track is a separate piece that is dove-tailed into the spider - very similar to high performance motorcycle rotor designs. Special rivets further secure the rotor, while allowing it to expand independent of the spider, which is claimed to survive significantly higher temperatures with less deformation. Will we see MDR-P rotors in DH competition? Keep an eye out, it's sure to happen. Here's the official press release:
PRESS RELEASE: MaguraMaximum performance and safety for e-bikes.
With its new eSTOP brakes, MAGURA presents two disc brakes that are specially adapted to e-bike requirements. In combination, the new SPORT pads and the MDR-C or MDR-P rotors offer increased braking power and stability for e-bikes.
The gentle pedaling support offered by e-bikes brings a smile to riders’ faces – but it also increases the weight of the bikes. It’s a lot more enjoyable riding effortlessly uphill – going downhill, however, the increased mass and higher speeds pose new challenges for rider and material. To meet the special requirements of e-bikes even better, MAGURA presents specially-optimized components to coincide with the Eurobike – MAGURA E-Bike optimized.
The eSTOP system consists of 3 components: the eSTOP brake models, optimized rotors and the new SPORT brake pad. All the components are perfectly matched to each other, offering maximum performance for the higher requirements of e-bikes.
The new rotors are specially reinforced to provide increased lateral rigidity and heat resistance with reduced vibration. For the first time, the two-piece MDR-P is now available in 220 mm diameter, offering optimum braking performance even under high continuous loads. The new rotor diameter offers 10% more braking force for the same manual force.
All components are available either individually, as eSTOP brake sets or as upgrade kits.
eMTB professional Stefan Schlie talks about the new MAGURA MT5 eSTOP