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Why would you want a 10 speed cassette on a lightweight e-bike. You will never need to use all of those ratios.

May be difficult to get a 9 speed cassette to fit.

Will your frame stretch to 135mm?

I have thought for some time that motor manufacturers label the same motor differently depending upon the market. I have a Bafang SWX02 and I’m pretty sure the 250w 350w and 500w motors are the same. You can buy them with different numbers of windings, but they will still operate at 250, 350 or...

Ooh. Just found this post: https://www.pedelecs.co.uk/forum/threads/carrera-crossfire-e-with-broken-anti-rotation-washer.40764/

Just Google anti rotation washer and loads come up on eBay.

This scenario usually results in bent or broken pins.

Be careful with the hall sensors. They aren’t all the same. Some trigger when they sense a North Pole, some trigger when they sense a South Pole, some are latching and some are non latching. If you still have all 3 original sensors you can cross check the numbers on them with a data sheet that...

Use this video to set it up.

I had to glue an extra magnet on mine because it wasn’t powerful enough to trigger the hall sensor. Weak magnet Extra magnet

Your speed sensor is not working. That’s why the display keeps shutting down.

I have seen many times where people post controller errors and then ignore what Saneagle and others say about checking connections first. Then they spend ages and waste money replacing parts only to find eventually that the fault was a connection problem.

Most of the time it’s a connector problem. There are many posts on here like yours and after chasing their tales for ages they usually find a pin isn’t making contact properly somewhere. Either a bent pin in a Julet connector or JSTSM pin not making proper contact. I have had it happen several...

And also are you sure the bike will still fold properly if you stretch the forks by 25mm?

Yeah, the problem is that one side has a tendency to bend more than the other if you try the cold set technique with studding. I cold set a rear swing arm for my Puch the other day from 130mm to 155mm. But I had to fabricate a jig to do it out of 18mm plywood so. I could stretch each side...

Yes it’s huge and heavy. Can’t really peddle it properly. I ghost peddle and let the motor do all the work. It’s why I can only get 20 miles of range out of it. But that is mostly flat out at 30 amps. Which is why I’m building a moped. Leather panniers you say. Like these ones? They came with...

I like the Bafang GO20/SWX02 (10). It’s small, lightweight, cheap, reasonable quality, readily available and can be run at ridiculous power levels with a few modifications. It also has good spare parts availability, so if it is abused the clutch and planetary gears can easily be changed at...

Not much you can do if the magnets have overheated. I guess you can replace them all if you can find some.

£100 through Bikesure. Much cheaper than a Surron or Talaria. I estimate total build cost at £3K with all new parts, including blasting and powder coating the frame. I’m going to build the battery and that will be around £1K and motor/controller another £800.

I decided to build an electric moped. Picked up a 39 year old frame with a v5 from an auction last week for £170 plus buyers fees. So no mot required after next September and free tax the following April. Most of the stuff that came with it was junk and has gone to the recycling centre...