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But gradient is elevation divided by distance, so gradient is directly proportional to height, or for the same distance a 1% increase in height is a 1% increase in gradient.

The easiest way to test is to remove the pins from the block on the end of the extension so that you can apply 5v to the black and red wires. You can use an old USB charger, any 5v charger or three AA cells joined together. Once you have that sorted, you only have to measure between the blue...

What about the letterfrom the DfT about throttles? I think you know the one I mean. My previous statement was about what's allowed. It seems that you have a different interpretation of what's allowed to me.

All up weight is approx 100kg, so 1kg makes 1% difference. The formula for going up a hill is Power = mass x gravity constant x dh/dt, wher h is the height and t the time. Turn it round to get dh/dt = P/mg That means that the rate of climb is directly proportional to power and inversely...

None of that is relevant. Show me an ebike battery that uses active balancing! Nearly all ebike batteries only use top balancing. Have you ever looked inside a battery to see what a BMS looks like or studied how it works? If you had, you'd know that nearly every one is similar to the one in that...

All you need to get up any hill is enough amps and a motor that won't burn when dealing with them. I've just been trying my 250W Bafang CST hub motor up a hill. It runs with 48v and 28 amps. It's the same weight as a Bosch, but it'll go up just about any hill twice as fast (subject to 15.5 mph...

That only applies to selling bikes with throttles, not to fitting one yourself. Don't forget also that we had a years grace on the implementation of the rule to clear stocks of bikes with throttles, so the effective date was Jan 2017. Whatever the situation, nobody has ever been prosecuted...

All controllers work more or less the same, so you can replace it with any one. It's always best to buy the controller and the LCD control panel as a pair. Cyrystalyte are still in business and they have a European shop, though very expensive. Before commencing, you should confirm that your...

Which connector do you have on the motor? If it's the 9 pin round one, do youhave the extension that runs to the controller and does that end have a 9 pin or the white 6 pin block? General rule. Never repair anything until you've tested that it's faulty.

To make it simple. You can have an independent throttle on your bike regardless of when it was made or sold. That's always been the case. The rule change fixes the bit where ebike shops couldn't sell a bike with a throttle after 2017. Now they can as long as they have the certificate. All this...

The torque at the back wheel varies depending which gear you're in and what the exact gear ratio is. It's also dependent on the wheel size. What's worse is that it changes with the motor speed to. The only way of making it meaningful would be to specify what it is at the crank at a specified...

You can't change anything in the hardware of that controller because it will be potted. If you can find the secret button sequence in the display, there might be a setting for maximum current. As above, there's nothing to stop you from using a different controller that you can install anywhere...

Yes, if the manufacturer has a type approval certificate.

You should always follow the manufacturer's advice because they generally know what's in their products and how they work. For anybody else in doubt about why 80% charging is not a good idea, here's an animation that shows how a typical ebike charging system works. They nearly all use what's...

As I have posted in other threads, where there are lengthy discussions, nobody is disagreeing with the battery university. It's just that 80% charging doesn’t work on our batteries because of the way the balancing system works.

Freego has more or less been taken over by E-bikesdirect, who have all the spares and left over stock. They offer 12 months warranty on the Freego bikes they sell, which are very discounted. They have an excellent returns service if you need any warranty work. All the parts on a Freego are...

The clutch is inside the disc-shaped middle bit. If you hold the very middle bit and turn the outside with your other hand, it should turn in one direction and lock in the other. If it turns both ways, you need a new one, which you can get from Greenbikekit.com. Make sure you get the right...

Blown MOSFETs in the controller. You can buy a complete new controller as a spare part. It's only held on with three screws, though you have to take off the chainring to get at it.

People keep reposting this utter bumkum, which keeps the myth propagating. A timer is a good idea to make sure that you don't leave your charger on too long after you get the green light. You should always charge to 100%.

There are a lot of complications with fitting mid motors to carbon frames. Normally, you need special adapters in the BB, you need a way of stopping the motor rotating around the BB and sometimes the frame is just too thick at the BB to let the motor in, so you have to grind away and then...