The CYC motor is not so good for a bike you want to use on the road, especially with your low gearing. It looks like you only have room for a small chainring, so it'll be hopelessly under-geared. It'll be a nightmare of never being in the right gear. Your gearing might be fine for lazy unassisted pedalling, which is about 60w through the crank, but when you try to put 5kw through them, you'll only want to use top gear, which will probably strip before you get to the end of your road. If you want to go fast on the road, get a direct drive hub-motor, but don't put it in your Boardman because it will render your rear suspension useless too.
Another thing. I built a bike with a 52v BBSHD running at 30A. When you opened the throttle, you could feel the whole frame twisting under the motor's torque. You want to run with 50A?
Look let me clear something up, I want to buy a battery once, not twice, I'd rather get a battery with high quality cells and a decent BMS once than save a miniscule amount on a less capable battery. I intend to comfortably ride the bike in a safe manner, yes maybe I could've spent less money on a bafang or something and fitted it to my other bike (which would problematic due to chainline problems with that bike as well), but I've already spent enough time mulling over it such that I feel it's worth it.
Even if it means I end up riding this bike at 500W peak should it be comfortable and safe then so be it, the x1 pro doesn't weigh much more than a bbshd and it fits on any bike I want with no chainline issues. My target speed is around 20-25MPh which the gearing on this bike will do just fine, I don't care about speed. Yes I could've opted for say the x1 stealth instead, rated at 1.5kW, but it's an outrunner motor (worse cooling) and isn't much less.
I'm not even going to install a throttle, I'm fully relying on the torque sensing.
I got a good deal on this bike, purchased it for just over a third of its brand new price in great condition, and I eventually decided I wanted to make it an ebike. So it's what I'm going to do. I want an overbuilt motor kit because why not, end of, all I want to know is where I can get a reliable battery in the UK but I'll just stick to EM3EV once they restock next month.
- Also note the part where I said I can easily switch this kit onto another bike, down the line once I may end up doing this, but for the next 2 years I'm not going to have enough space to have 2 bikes so this is an all in one for me, I'm currently away from home for my studies.
Aside from the legality aspects and muddying the waters for we law abiding riders, why do you feel the need to have so much power? It really does not have any advantages over a good legal mtb or road bike.
Because why not, I'm not spending much more than I would've with an e.g., photon, which was my initial plan, anyways read the above, I don't intend to ride this bike like those idiots on surrons speeding on shared pavements endangering others, I'm just wasting my money because I've got nothing better to do
