I know this thread is a couple of months old, but I feel it applies directly to my question and may complete the picture for other with similar questions.Magura MT5's are pretty much the best ebike brakes around. You can go crazy with say Hope brakes or something, so its possible to spend a lot more and get a little better stopping power.
Best option is the MT5 brakes and then buy the cheaper, and better, Tektro Type 17 2.3mm thick rotors. They were originally a niche product for downhill bikes but then Tektro realized they could call them ebike rotors and sell them by the shipload. MT5's normally use proprietary, thicker 2,0mm rotors and the 2.3's work, albeit just barely when the pads and rotors are both fresh/new.
The site says $32 each rotor but you can find them online for $25.
The MT5e is an ebike-capable brake with much improved brake levers, which are meant to satisfy certain moped ebike regulations in the EU but which end up just being a lot better. They use red HIGO cutoff plugs, which you can either buy adapters for, or just buy a compatible wiring harness that has red plugs instead of yellow ones. California Ebike sells those.
This e-bus cable is the main wiring harness which extends from the motor to the handlebars and allows you to connect throttle, brakes and display. This cable is required when using the Magura MT5e eBike Disc Brake It features two Higo 2 conductors (Red) plugs which are compatible with Magura...california-ebike.com
Here are the red-to-yellow adapters. Its cheaper just to buy a replacement wiring harness, and cleaner too.
Generally speaking, yes. Even bikes that say the max rotor size is 180mm, I have never had an issue going with 203's front or rear.... have a question about rotors. If the bike currently has 180 rotors (front and rear) would a very heavy bike like a E-Fat Bike benefit for going with larger rotors.
They go with any rotor diameter provided you use the right rotor adapter. And you do NOT need to use 2.3mm rotors. Its just a smart move as they are inexpensive and an upgrade over other options that are typically more expensive. Magura calipers are meant to take Magura rotors, which are 2.0mm thick. Thats versus typical rotors which are often 1.8mm thick, and can be as thin as 1.4mm. So the great majority of off-brand brake rotors will not work. For a factory fit you can use any size of Magura Storm HC rotor, or the newer Magura MDR-C rotor. Both have lots of meat on them and are 2.0mm thick.From reading, I gather that the MT5e's work with 180, 203 & 220 rotor sizes (I understand that I need to choose 2.3mm thick rotors).
The bolts are a simple M6 socket cap you can get in a hardware store. You can re-use whatever is on the bike already as the bolt engagement doesn't change. However I have found it makes some sense to buy longer bolts so I get complete engagement of all the available threads instead of a bolt that only goes in 3/4 of the way. Buy stainless steel and get some M6 washers to put under the socket cap but over the caliper.I know I will need a caliper adapter if I go with a bigger than stock diameter rotor (if you can please help me find the correct adapter and the bolts).
In real world use? No. You could crack open some schoolbooks, theorize its possible to have too much braking force and posit some potential consequences from that, but in practical reality that never happens. Even so, if your front fork is rated for a 203mm rotor then you're within spec. Same goes for the frame. I've done 203 rotors with frames whose spec says 180 max and never had an issue. And that includes cargo bikes that get up to a total system weight of 500 lbs loaded. If you are doing extreme downhilling or something like that and you are slamming on the front brakes mercilessly then maybe you want to live with a smaller diameter rotor within spec.Is there any disadvantage (other than the little bit of weight and the extra adapter) that would make this not a good idea.