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Some useful info here if you find out the controller's knackered. Though I wouldn't use the controller he did. You need a KT controller because you need current control for a crank motor. His is speed control...

Throttles are not a grey area. It's absolutely clear. There are only two rules: Firstly, your throttle is only allowed to work independently up to 6km/h. Secondly, you can still use a throttle above that speed to regulate speed or power as long as the power stops when you stop pedalling. You can...

Probably OK if you don't go over 30 mph. I fitted a similar one to my Audi a few years ago. I normally got 60 mpg at 65 to 70 mph. I was worried about the wind force on the bike/rack/tailgate so I kept my speed down to 50 mph. I could really feel the drag, and I got 30 mpg for that 200 mile...

First, I'd drizzle a load of 3-in-one oil into it. You can get some in down the back of it, but the best is through the axle. You need quite a lot of that oil and it has to be that type. If that doesn't work, you'll have to strip it down. The pawls are probably standard Shimano type. If you...

I'm just a person that had to fix all the batteries with burnt contacts! I still keep a box of different ones salvaged from different batteries, specially to repair the burnt ones. Do you know how a smoothing capacitor works, because there's a big one right across the battery wires? Look at all...

It's not odd, it's perfectly normal. It's not real voltage. What you see on your voltmeter depends on its impedence. around 12v to 18v is normal for most cheap meters. It's just leakage charge through the output mosfets. You can't take any current from it.

He has every right to say that. It sounds dodgy to me as well. Could you explain how you came by this battery and what its serial number is to put us at ease?

That frame was never going to be solid enough for one of those motors. For those big axles, you need a bit of meat around the drop-outs. It should be strong enough with two properly anchored torque arms at least 5mm thick. I think you need to make your own tie bars out of steel strip and clamp...

I already told you that 48v is not the half-way point in terms of charge in the battery in the battery. Also, there are two factors increase the depletion as the battery empties. Firstly, you need to turn up the power at the end of the ride to get it the same as at the beginning of the ride...

and what chemistry was in those Samsung Batteries? Did they catch fire because they were too warm or cold when charged? Where's the connection between phones and ebikes? Washing machines and electric bikes both have electric motors. Some Whilpool washing machines caught fire. Does that...

Where do you live?

None of it is critical. It's not that critical regarding tubes because they stretch a lot. The only important thing is the 622 for the tyres, which is the rim size. You go to a different width if you want - anything from 25 to 50 should be OK. Maybe a bit wider if your rims are wider than 19mm...

My experience is that if you buy genuine Honeywell sensors or other genuine branded devices, like mosfets, the legs are flexible and easy to deal with, but the cheaper knock-offs have very brittle legs that break when you bend them more than once., though probably worth putting up with that for...

By damaging and/or burning the contacts.

He said dendrites cause short circuits and fires. Use some common sense: How many ebike batteries have you seen spontaneously catch fire? That article is just irrelevant poorly though out research. The cell construction, anode, cathode and electrolyte were nothing like what you find in ebike...

Don't take any notice of that stuff. Most of it is hopelessly out of date. You're more likely to kill your battery by frequent removal than by dendrite growth. Those that worry the least have the least problems. Just use your battery and charge it until the charger goes green. That's all you...

There's no harm in charging at 4 degrees C or any other temperature. In theory, you can get a bit more capacity if you warm your battery up before charging, but if your journeys are not long enough to run it right down, that's not worth it. Also, the battery warms itself up when you charge it...

Suspension forks on 16" or 20" wheels are pretty well useless. You need proper air forks to solve your problem. I've never seen them for small wheels.

Show a photo so we can identify what you have. It's all standard stuff. Is this it? https://www.productponduk.co.uk/product-page/mens-petrigo-electric-bicycle

That's a good point. rather than remove everything, you can poke out the magnets one at a time and re-insert them the other way round. The magnets are tight in the plastic, but can fairly easily be poked out with a small screwdriver. Turn the bike upside down and rest it on the handlebars and...