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I converted a dahon clone with that 74mm front forks tbk kit https://www.pedelecs.co.uk/forum/threads/converting-a-little-folder.47261/post-716537

It's good to ask here for advice but sometimes people can end up in "analysis paralysis". There's something to be said for hands on doing conversions and learning that way. A Yosepower kit is a good, inexpensive starting point that you can later do upgrades and refinements if you want to

I think the yose kit has a speed based controller - as you approach the "speed" for that PAS level, the assitance decreases, and above the speed for that level it won't assist you at all. There are also "power based controllers" (e.g. KT )where the PAS level equates to the assistance in Watts.

Makes sense to me - just have to be careful with the tooth capacity https://www.bikeradar.com/advice/buyers-guides/a-complete-guide-to-rear-derailleurs

this is rather expensive (and I'm not sure it is compatible) but https://www.aliexpress.com/item/1005008751262074.html

controllers and displays have to match to work

One of the things about speed on a bike, especially at higher speeds, on the flat it is very much affected by riding position and tyres. A rider on a road bike with drop handlebars and road tyres with 300 watts of power will do 25 mph, on a mountain bike with flat handlebars and MTB tyres they...

Don't know if it's any use but on Amazon if you pick an e-bike eg https://amzn.eu/d/an9Z5aZ (don't know what style you want) then you can apply for credit Eta Actually cheaper here , use code UFF35 for £35 discount, free delivery https://www.samebikes.co.uk/products/samebike-cy20-66dt And can...

It's not a very stringent test, if someone set their wheel size to 16" and their display to km/h then an indicated 20km/h would actually be 20 mph but would pass this test

Yep, if you want buy a suitable donor bike off Facebook marketplace (plenty with disc brakes for under £100) and fit something like a Yosepower kit you'll have change from £500 and you can service it , fix it and upgrade it yourself...

Yes, I had noticed issues with these on the forum, I think it was the difficulty of fixing them that was the problem. Possibly better getting one with generic Chinese components, at least it is easy to fix if anything goes wrong. £500 is quite a low budget, but there are bikes on eBay / Amazon...

I guess this would be another possibility https://www.ebay.co.uk/itm/194504567278?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=Ri1CL0KVQhm&sssrc=4429486&ssuid=e7wJGK-DRD6&var=&widget_ver=artemis&media=COPY

One thing I just noticed is that it is 3*7 gearing (so I guess it will be a freewheel). The motor hub wheel has an 8 speed cassette ! Can I use that and just use the top 7 gears of the 8 speed cassette ? Or do I need to buy a 7 speed cassette (if such things exist)

Ordered ! Went for the blue calipers , £20 for the pair including delivery and tax

So this is the new donor bike (£80) - it honestly looks like it has never been ridden @Ghost1951 @saneagle - how are you getting on with those Zoom Xtech HB-100s ? This has combined brake levers / shifters so a cable actuated hydraulic caliper would make sense. It's for my niece who is 60kg...

Too good to be true ? https://www.aliexpress.com/store/1104653358?

Although China is slightly higher per capita CO2 emissions than us, than doesn't account for emissions embedded in traded goods : We are importing "emissions" in traded goods without them being accounted for

A nominal 36V battery is 42 V when full :)

250w is the rated power, the actual max output power from a hub motor with a 36v 15 a controller with a full battery will be closer to 500W (42v *15amp * 80?% efficiency)

These are easy to convert and fold up (bi fold rather than tri fold) but my mother in law gets it in her supermini https://www.pedelecs.co.uk/forum/threads/converting-folder-bike-to-cassette.47893/post-733513