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I used to build large PA speakers back in the 70s and burned a few coils after feeding too much power into them. Back then, I just rebuilt the coils but I can't see anyone redoing the coils of a motor.

government should spend the money on funding paid apprenticeship instead of those useless courses.

I reckon it is sustenable but you would be limited to basic models. Lots of them operate on those lines. Chinese factories start with very good value basic models for around $500-$600 and offer to upgrade components, batteries, motors, forks, brakes, rack, propstands, lights, bells etc. The...

They are on trustpilot and a UK company so you can lookup if you like. Their bike is good value for money. You should very much pay attention to support arrangements when buying a factory built bike. Unlike adding a kit to your own bike, like Andybike said, the mechanical bike can be built with...

an extraordinary man from an extraordinary family. He worked until he dropped. His work on Lithium batteries are groundbreaking: Lithium Cobalt oxide, Lithium Iron Phospate. He also worked on computer magnetic random access memory. His latest work on glass to replace liquid electrolyte in...

you need a sizable 48V 30A+ controller for 100NM. That bike has 350W motor.

Very sorry, I evidently need new glasses. Your bike is in excellent condition. If you want to convert it, I would suggest an XF08C rear hub which looks very discret or a middle motor like TSDZ2 which has excellent natural ride feel. Email kits@wooshbikes.co.uk if you are interested.

It's not the first time that torque figures are discussed. Saneagle has a clear view on this. I think although it's complicated, it is better to understand the physics (tyre radius, weight, gradient, speed, mass etc) so you can make better decisions. I don't know which motor the Estarli uses so...

As saneagle said, torque numbers are meaningless. You need to specify a host of other details like power. yield and RPM. Manufacturers supply test charts to help with selecting the best motor for the job. I usually look for maximum torque for 180rpm at around 500w for my 26 and 700c bikes to run...

It's just a bit difficult to get your head around the numbers. For hub motors, the torque is measured at the wheel so the tyre diameter is important, the resulting climbing force at the point of contact with the road is inversely proportional to the radius of the tyre. Smaller wheels correspond...

Ebike batteries should last for a decade if not for other considerations like fire risk.

he's willing to convert a bike. He can start with a £500 bike, add £600 for a decent road legal kit, he'll get a bike that can winch him up more or less any big hill while pedaling as much or as little as he likes. If he's happy with a second hand donor bike, he can get a very decent...

it was a pretty forgettable episode of BBCQT. Prof John Curtice decided to make up the audience with 70% brexit and still brexit, 20% brexit now regret + 10% brexit now undecided. The first subject was how much brexit has to do with the cost of living. The remainer camp is represented by...

it's an attractive idea but I don't have any partner with workspace for such a project. I don't have space here for more bikes or kits.

I haven't got one so can't help you there.

BBC QT will be at Clacton on Sea tonight at 8PM on iplayer. The audience voted 100% for brexit in 2016. How many would now regret their choice? What do you reckon?

the guys over at ES may have done that. Did you look?

I did not say that any of these kits are. Those brands are very well known. What I said is none of them will be a big seller. You can pop in the average European e-bike shop where you'll find maybe 100-150 models to choose from, then ask to test ride a Neodrives or a Zehus. I reckon they will...

I could modify the OSF code but would not want to do that.

his Raleigh has the worst possible combination for a steep hill: torque sensor + hub motor. He can probably gets up to the top of Winsley Hill on the Santana but at 90kg his own weight, I think he would be better off with a BBS01 48V crank drive kit. I will test a 48V DWG22C on the Santana when...