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15amps continuous. 25 amps burst. That's OK for a BBS01 on standard settings.

40v isn't enough. You need to go higher. This one is 50v https://www.ebay.co.uk/itm/DC-DC-4-5-55v-to-3-3v-50v-5v-9v-12v-24v-Buck-Step-down-Regulator-Converter-Board/252510783885?hash=item3acad0c98d:g:QzAAAOSwbiFZRJBVYou have to be careful with cheap buck converters, if they blow, they dump the...

It's a Julet connector. I can't say that I've ever seen one for sale. Even if you could find one, it would be moulded to the wire, so you'd need to solder the wires. People are always asking about battery connectors. You don't need them. They're only a source of trouble. It's much better to cut...

As I said, you can achieve the same by grinding off the inside of the pedal arm. That costs nothing.

You have to remember to change down through the gears as you slow down. Derailleurs can only change gear when the chain is moving, so you can't stop pedalling to change gear. The more tension you have on the chain, the more stress there'll be on the components involved, and you get a bigger...

Did you bridge the data wires as well as the red and blue power wires? If not, try it like that. 10 miles is a long way to go before a fault showed. It sounds more like an intermittent fault than a systemic one. Check your motor connections at the controller and that the 9-pin connector is all...

Don't tell us you've been caught dongling again?

The chainline doesn't matter as long as you can change gears and the chain doesn't keep coming off the chainwheel. A worn chain helps. You can use any cassette you want, but you'll need a shifter with the right number of speeds to go with it.

You don't need to replace the controller. The blown transistor won't do any harm. It only switches the lights. Use an external switch. If you want brighter lights, wire them to the battery Splice in a couple of wires anywhere between the controller and battery. For 12v lights, you'll need a...

It's not the type or weight of motor that breaks the drop-outs. It's the installation. He has a 9mm axle, so he'll need to file the drop-outs too, but without inboard drop-outs, he'd be out anyway, so no point in discussing until that's verified.

Thanks for letting me know. I've only been riding, building and fixing electric bikes for a decade, and I never knew that. You learn something new every day. Does that mean that I don't have to swap out my motor-wheel every time I go to Asda, where the steep downhill makes me go over 15 .5 mph...

Bosch batteries are cheaper, more available and anecdotally more reliable.

I wouldn't fit a motor to those forks. It will spoil their operation and there's a fair chance that you'll break them. The lowers are magnesium. Also, on some SID versions, the drop-outs are not the most inboard point, which brings clearance problems. A rear motor is better anyway for many other...

You can find them on Aliexpress. You can use any one with the same width and depth. Check that they come with the matching base plate and lock strip.

The law applies to everyone not just you, so they have to cover the worst case scenario. They have to prevent idiots from doing stupid things, not allow everyone to use their discretion on what they think is a suitable speed for the conditions they're riding in. That's why we have rules and...

Controllers for brushed motors are really cheap - much cheaper than a rheostat...

You've most likely blown the transistor that does the switching inside the controller. They're only designed for low-power lights. Did you try to connect higher power ones? The voltage doesn't matter. It's the current that counts. You can still solve it by using an external switch on the wires...

Get yourself a hub-motor, then you can use one of these and it'll last you a lifetime. https://www.ebay.co.uk/itm/Vg-Sports-11-32T-Road-Bike-Cassette-10-Speed-Freewheel-Sprocket-10S-Bicycle-C5R3/333341394942?epid=14032095535&hash=item4d9cb207fe:g:NBcAAOSwIh5djNRM

It's all very well thinking about yourself ghosting along at 20 mph down deserted open roads, but you have to also think about the busy narrow cycle paths during London rush hour, where people will be passing within inches of each other with a closing speed of 40 mph. The 25km/h is a concession...

You can remove about 1mm off each side of the magnet disc in the centre with a Dremmel or file, and you can remove up to 5mm off the inside of the pedal arm with a grinder or file.