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Any efficiency advancements are minimal. They can tune a motor to be most effecient in a zone where someone is more likely to use it, but they can hardly increase the motor's efficiency. Motor efficiency already reaches 80% in some circumstances, so the biggest theoretical gain would be to 100%...

Any bike can get that range if you turn the power down far enough and pedal hard enough. Range isn't a characteristic that comes from the bike, except that some bikes have bigger batteries than others. Instead, it comes from how you use it.

Using a higher voltage on a crank drive motor doesn’t work. 36v will make the crank spin 50% faster so you won't be able to move your feet fast enough to keep up. Secondly. It will make the motor less efficient, which will make it heat up until something burns. The 36v Sunstar is different to...

You have to be very careful with any mods to a BBSxx controller. The potting is absolutely essential. Without it, if any water gets past the gasket, your motor will spontaneously catch fire even when it's switched off at the control panel.

How far do you need to go? You should get at least 30 miles from that Dawes.

A little write up on what you had to do would help too because this service is going to be extremely useful for all those guys with rotting Kalkhoffs in their sheds.

You don't notice the difference so much on low power bikes, but on high power ones, current throttles are more or less essential. Also, current throttles work better on crank drive bikes because of the high torque they make in ghe low gears.

I think you have to be careful that you get the right teplacement motor because of the width of the frame. Can you confirm the width of the frame between the drop-outs? Where about are you?

Your requirements are going to make it difficult. I can't see it working with a basket unless you can find a quick release one that you can remove for folding. Suspension normally adds a lot of weight. You need to tell us how far you want to go and how much you want to spend.

Settings,

A throttle is useful for all sorts of things. It's saved me a few times when I was not able to pedal. If you're pedalling on level one and you need instant full power, the throtte will give it to you. It can make hill starting easier and is good for getting you going when you're hampered by...

When you build a battery it's too easy to nick through the heat-shrink with the sharp edge of the nickel strip. The cardboard rings give you insurance against that. There are various other useful insulators and sheet that you can buy to give your cells more protection, which you can find on...

Sorry to have to be contrary, but can you produce some evidence that anyone has ever been prosecuted? There has always been scaremongering, but nobody has ever given us anything concrete. The aregument about tighter legislation because there are too many illegal bikes has been running here for...

You can't really do anything on a crank drive bike. Assuming that you start only in first gear, you can get more torque by using a first gear with more teeth, a chainwheel with less teeth or a smaller back wheel. That torque will only last until you engage second gear, when you're back to where...

You should use the insulator rings on the tops to avoid that...

Yes, that one's not as easy as the KT, unfortunately. If you find that it's a pain, you could try contacting Xiongda about buying the KT one. Their customer service is very good and the cost of their spares is surprisingly low.

The different levels on the LCD should give you different power levels. They offered two different brands of controller that each had different software. The label would indicate LSW or KT somewhere. Do you know which you have?

Guensey is a tiny island where everybody can see what's going on. It's nearer to France than our mainland and it's not even in the UK. Stop being a smartass. If it really worries you what's going on 100 miles out to sea, give up the idea of that 1000W kit then.

I can't find any evidence of an illegal electric bike rider ever having been prosecuted, but you have to bear in mind the case of the fixie rider that hit a woman when she stepped out in front of him without looking while texting. She died. He went to jail for a long time because he didn't have...

The Xiongda two-speed has special software in the controller to reverse the motor for the low gear, so no other controller can be used. The controller can only accept an input from a cadence PAS or throttle. You therefore need a device that converts a torque signal to a throttle signal, which...