With the growing global demand for e-Bikes, there’s been a lot of development tech done specifically for their increased weight and power, but we’re starting to see some of that tech trickle over to “analog” bikes, too. TRP’s G-Spec DH bracelet uses an e-MTB compatible 2.3mm rotor, which has 9% better heat tolerance, and 35% more resistant to deflection. Meaning, it’s stiffer. Compare that to the standard 1.8mm rotor found on regular mountain, road, cyclocross and gravel bikes.

The G-Sped DH brakes were launched last year as a collaboration with Aaron Gwin and retail for $229 per wheel, but you can buy the thicker rotors separately for $39-$49 depending on size. Just keep in mind, regular disc brake calipers may not be able to handle the extra width, either because the opening is too narrow, or the pads won’t retract far enough. or both.

TRP eMTB hydraulic disc brakes for e-mountain bikes

Along with the recently released G-Spec Trail brakes, there’s also a new e-MTB brake specific model that gets their smaller, lighter trail-sized master cylinder and alloy lever for $149/wheel. Rotors sold separately.

TRP hybrid brake pistons use a combination of materials to improve heat resistance

One of TRP’s technologies are these hybrid pistons that use stainless outer sections with a composite inside. The design not only saves weight, it acts as a heat barrier to improve heat resistance by 28%. Meaning, less braking friction heat transfers to the brake fluid, which is what could cause brake pump or fade.

Why stainless steel? Stainless has a rougher surface texture of microscopic pores (without being porous), so the hydraulic fluid “sticks” to it making it very smooth and frictionless. They say that’s why stainless refrigerator doors hold onto your fingerprints so well, because the oil from your skin gets into the surface. The benefit is smoother brake feel and quicker, more reliable retraction when you let off the brakes.



  1. Bob on

    I was always told that e-motorcycles didnt have any more power that a regular bike. So why the need for all this extra e-motorcycle specific stuff?

    Waiting for the bike companies to bring back the old dual front disk stuff from 20 years ago.

    • Nigel on

      How much extra weight? Bike vs E bike is less than the variation in rider weights.

      Maybe it’s the combination of E bikes and heavy riders.

    • Robin on

      It’s pretty simple, really: the energy that needs to be bled off by brakes varies directly with the mass being slowed. E-bikes have more mass than traditional bikes. E-bikes can travel at the upper end of the distribution of typical bikes speeds, and the work required to slow something varies with the square of the speed. There you go, Bob.

      • JBikes on

        I’d wager its not so much the speed capability under power as it is primarily the ability to carry more robust components that work better. Like it or not, bicycles are compromises in design/function for reduced weight because they are human powered. The std width rotor is decidedly thin. Nobody worries about 1-2 lbs extra mass on top of a 40+ lb bike, when you have a 250-500W “tailwind”.

  2. Tom on

    Bob, are you talking about e-bikes? or e-motorcycles? They are different. Who said e-motorcycles didn’t have more power than regular bikes? In both cases, e-bikes and e-motorcycles, they both have motors. Of course they are more powerful than a normal bicycle. They also weigh more, because they have a motor.

      • Carl on

        If we’re gonna do this, then a pedal-assist e-bike would be a moped. Motorcycle implies the need for a special license to operate it, at least in the United States.

  3. Bmx on

    There is nothing less massive than a fully loaded touring tandem with two blokes. Suppose that’s why drag brakes were a thing. Find my hopes v4 brakes handle a loaded mtb going down 33% gradient fairly well.


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