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If it does 21 mph with the wheel in the air, it's not restricted in any way, so no Speedbox or any similar device would help you. You need to provide information about the battery and controller in order to get advice on how to get more power.

Here it is at only £231 inc shipping. As well as a cassette motor, the KT controller is 17A, so at 48v, it'll give all the hill-climbing you want. Best of all, it has the block connectors for easy testing. One of the pictures in the description shows a torque arm and the packing list says, "zip...

Is it this one?

For the last few months, I've had to use my crank-drive bike because it's too comfortable and convenient. I suffer from shoulder and neck pain on my hub-motor bike, which has normal MTB type bars. The crank-drive bike has nice Raleigh North Road bars, which are lovely, plus it has that comfy...

Stretch a piece of old inner tube over it.

It might be an idea to order a complete new battery base if you can get the right one with the right connector. The battery wires are very short and go straight to the controller, which will probably be potted, so you can't easily remove it and it doesn't normally leave enough room to join new...

A normal KT controller uses the hall sensors to get the cut-off speed, but you can adjust the speed that it cuts off in the user settings (hold + and - buttons down for a few secs withing 5 secs of switching on). The normal speed display comes from any speed sensor. Most motors have one inside...

I think you're going to hate the controller, especially with 48v and 20A. Speed control is tolerable with low power, but you can't control you're pedalling with 1000w from the battery that you can't turn down. That brings me to the second point. You might as well order the DNP freewheel today...

I can't understand why you guys write pages of script instead of giving us stuff that will help us to help you. None of what you're saying makes sense. All silver fish batteries are about 75mm wide because that's the length of the cells which always lay in the transverse direction. There are two...

Nobody has determined that the battery is defective. According to the info above, it's simply run flat.

Without photos, all we can do is attempt to read your mind. My telepathy skills are waning in my old age, but when I really concentrate, I see a standard silver fish battery, but they're 75mm x 110mm. Please let me know if I'm right.

It's a nice bike. I hope it gives thousands of miles of pleasure. The only problem I see is the possibility to fix it if anything goes wrong. The motor system is made in the Czech Republic and not very common. Rock Machine only list one dealer in Liverpool. Maybe there are more.

I'll try it. Thanks for all the good work you're doing. The goal is for everybody to enjoy a better riding experience.

Please report back how you get on with them. I'm going to bet that you'll be very happy, but we don't know what we don't know and there are often unforseen circumstances.

I used to be for all that sort of thing, but now I think it's a bit irresponsible. It worked, so we have to give that to him, but what he built was very dangerous. There were no positive end ring insulators, so high risk of shorting the nickel strips; and no double insulation of the sense wires...

That would be excellent if they had such shunts, but the only shunts I've noticed are the ones between the battery and MOSFETs to measure the battery current. Have yours got them on the separate phases?

They're all over Aliexpress for about £24 a pair - cheaper than a pair of pads that some people on this forum pay...

It doesn't matter what any theory says. Anybody, who has used a KT controller with current control can see that torque is flat across the speed range until the back emf becomes the controlling factor. Normal phase current control without other effects of field weakening or timing control can't...

That article is complete BS. He mentions twice that the controller increases the voltage by PWM. It doesn't. The battery wires go straight to the MOSFETS and from there straight to the phase wires. All the CPU can do is open and close the gate. No other components are involved.Secondly, the bit...

They're very expensive. You could probably get a couple from Screwfix for a lot less; however, you might not need them. Put the nut in the dimple to see if it fits. They normally do. The only reason I suggested the washers was because I thought you had aluminium forks and in that case if the nut...