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The 20" relates directly to the wheel size and indirectly to the speed. A 20" wheel has to spin faster to get the same speed as a 26" one. Hub-motors need to run in their efficient zones considering RPM, which is at about 75% of their maximum speed, so a 15 mph bike needs a 20 mph motor, which...

True fact. I was training a student about quality control, when I went to the vending machine to get a Mars bar and it delivered one that was about an inch shorter than normal. To get the exact evidence, I took it into the lab and weighed it on our calibrated equipment. This gave me the...

It doesn't have to be eliminated. Instead, it should be moved to the right place.

Thank you very much for the work you did and the detailed explanation. It's going to help a lot of people.

Keep politics out of this forum. It's supposed to be for chat about electric bikes, not politics. The title says Electric Bike General Discussion. What has what you posted got to do with electric bikes. There's a special part of the forum reserved for general chat where you can put it if you...

You need a 100 amp BMS and cells than can deliver double that to be safe and reliable. If you overdrive the cells, they'll catch fire and explode, and you'll be in a lot of trouble. If you run any ebike battery at 50 amps, it'll get dangerously hot. I can see that this project is not going to...

Just to let you know that there is no law relating to actual maximum output power allowed. The law is that the MOTOR must be RATED at no more than 250w. The next thing is the difference between input and output power. Let's say you had a 20A controller. The maximum input power that the...

Doesn't count because you crashed and ended up in hospital.

It wouldn't surprise me if your controller can't even measure phase current. Instead, it measures the battery current and derives some number based on an arbitrary calculation. Let's say your motor is running at 200 rpm, has a reduction ratio of 8:1 and 12 poles. That would mean that each phase...

Read again what I wrote. I added to it. You were too fast.

You don't need to worry about phase currents. They're pretty meaningless and not easy to define, since they're not continuous and go in both directions, so net DC phase current is zero. The battery current is easy to measure. It's equal to the sum of the phase currents. There's also a more or...

Keep going. Please let me know when you've found something useful.

Peas or beans would be the best. Don't forget to remove the battery in case of contamination.

I love the work you're doing. Anything that anybody does to add to the knowledge base should be congratulated. Over the 15 years I've been riding electric bikes, I tried just about every motor, controller and system in an attempt to find the perfect ebike solution. For me, the standard KT...

The post doesn't encourage anybody to do anything. In fact it does mention that you should follow local laws. The post itself doesn't violate any laws, so that bit doesn't apply either. We can argue all day about whether posts like that should be allowed, but I don't see any rules or laws broken.

We have frequent scammers offering stuff for sale that they don't actually have. The scammers are always brand new accounts that appear a short time after somebody is having trouble getting the thing that the scammer is offering. My advice is that nobody should send any money to anybody that...

If it helps, here's a trace from a standard KT controller. You can see that changing power levels gives a more or less instant step. Likewise, look to where there is zero current because of free-wheeling, then see the step when the pedalling starts. The scale at the bottom is seconds, so if...

More like an imagination issue. I've used more than 10 different KT controllers over 10 years and never had any issues.

How are you going to get to Eastern Europe? You can't take an ebike nor battery on an aeroplane. For conversions, some bikes are better than others. The best bike would have disc brakes and a conventional triangular frame. Show us what you have.

I already said that I need around 800wh. Those 28As won't even give 400wh. When I first started riding an electric bike in 2010, I had 360wh. Today, I can enjoy 1000wh for £300, which does everything I want. 400wh is of no interest to me