Hey all you said is perfectly fine and correct

✌love a good debate on bike things


Totally agree on the bare minimum front/rear 203mm for an mtb ebike(don't forget the thickness also I would say 1,9mm is the minimum).
Although there are different standpoints of viewing on this. Don't get me wrong don't want to argue just trying to have a good debate, I an a bit intrigued by such controversies that go against the flow. Not all riders(weekend warriors) are skilled enough and fit as DH riders...so I think there could be something on that theory



Mike Levy from Pinkbike thinks like that...I think he has a point also(loose ground)
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Bigger Isn't Always Better
Question: Pinkbike user Layman asked this question in the
Bikes, Parts, and Gear forum:
Why would anybody run anything other than the largest rotor? Other than a weight penalty, which is minimal, I can't see a disadvantage to going with a larger rotor. Am I missing something?
A larger diameter rotor will offer more power thanks to the added leverage that it provides, and it will also deal with heat better during long, hard descents like you'd do on a downhill bike, but outright power isn't always the only concern. Most people will cite weight as the reason for going with a smaller rotor, but I'd argue that using rotor size to tune how your brakes feel is the real reason to go down in size - a smaller rotor will offer a more controllable feel at the lever, which is especially important when riding in low-traction conditions. For example, in the summer I'll often use a fast rolling tire on the back of my bike and the trails can be a bit dusty and loose. My Shimano brakes have quite a bit of initial bite to them that can cause me to lock up my wheels unexpectedly when I'm pushing hard, but going from an 8'' rotor to a 6'' rotor gives me back a lot of that control. Yes, there isn't as much power on tap when using the smaller rotor, but the modulation that I get outweighs that loss in my mind. After all, almost everyone's brakes are more than powerful enough so long as you're using them as intended. That said, I'd prefer to run 8'' rotors anytime I'm in a bike park for the power and heat management. The one other thing to keep in mind is that some older forks with quick-release dropouts are not compatible with large rotors.
- Mike Levy
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Although we are taking ebikes here...the principle is the same(just bigger and thicker rotors here)
✌Cheers
