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You can have it both ways with A KT. It's switchable in the settings!

You don't need a steel bike, but if you can find a cheap one, that's ideal. Don't buy a new bike. Look for a used one with a triangle frame and disc brakes. There are always some on Ebay, Facebook, Gumtree, etc.

Brake rotors are interchangeable. you can use any deign you like as long as it has the same siameter (written on it) and the 6 holes for the screws. 100s on Ebay. I think it's 180mm, but check anyway. Chainwheels are also fairly standard. The important thing is the diameter of the fixing bolt...

The Freego one isn't that good, and if you can find one, it'll be expensive. You can replace it with a different one, which will be better if you don't mind doing a bit of soldering.

No, not without doing complicated electronics. Like many similar batteries, Bosch batteries have a handshaking procedure with the motor controller. You need a normal dumb battery

You need to tell us where you are!

It's nothing to do with economy. It's elecetrical system is flawed. There are many similarly priced bikes that don't have its bad torque sensor and motor connector.

Measure the cell voltages on the multipin connector.

You're not listening! If you want to go your own way, good luck, but you're wasting your time.

It looks like you got 117 spokes. Your old one doesn't look like 217. As I said before. you should take one of your good spokes and measure it from the middle of the elbow to the ned of the thread. Assuming that whoever gave you the sizes of 217 and 219 was correct. you should choose the...

There are three main problems with these bikes: The torque sensor, the crank seal and the motor connector. The torque sensor itself is not very robust. It seems to get problems with broken or pulled wires, which you sometimes can't see and the light sensors get dirty, so can't see anymore...

for 20 mph, you need a 260 rpm motor. Aliexpress is a good source of motors, though for most of them you need to build the wheel yourself. For 17A, m y favourite motor is the AKM128, but I'm not sure whether any are stamped 250w. The Bafang SWX02 is also good if you want a bit of power. there...

Don't take any notice of the weight limit. It won't break, but if anything goes wrong, unscrupulous dealers will try to worm their way out of warranty obligations. Talk to them about it before you buy and get a record of any agreements.

You only need one brake switch, so if you have one on the other lever, you can disconnect the faulty one.

I think you'd be better off getting a a new motor and controller. There's too much to sort out.

You can run your bike without the LCD. You just need to bridge the red and blue wires that go to the LCD. this gives you throttle operation and PAS level 1. On some controllers, you have to bridge the comms wires together as well. They're the ones that aren't red blue or black.

My wild guess says tha you have water inside your LCD. That's the only logical thing that can affect both. Is the motor turning at 4 mph or faster?

Does it have a throttle? if so, try disconnecting it.

The red and black wires are 5v supply. One of the others gives a 1.2v to 3.8v signal from the torque sensor. Thats the same signal as a throttle, so you could splice in a throttle to those three wires. The 4th wire is a pulsing signal that I guess is to indicate the pedals are turning. I don't...

That's a common LCD, so we know all the settings.