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I can't help thinking that having a class of pedelecs with a max speed of , say , 25 mph would allow more people to use them for commuting, even if they needed registration and insurance

I believe there is a 10 % leeway on the max assist speed , so if you found an e-bike which allowed you to set the max assist speed, you could take advantage of that , and set the max assist speed to 17 mph (15.5 mph + 10%). If you set it higher than that and ride in public (on or off road) it is...

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I've discovered the current display option on the display. It's basically 3 amps per assist level. It does vary a little bit, depending on how hard I am pedalling (between 2.3 -3 amps according to the display) I tried increasing parameter 14 on the display ( max current) but I don't think it...

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I used this to size my chain https://www.parktool.com/en-int/blog/repair-help/chain-length-sizing A new chain quite often slips, mine started off slipping on the 11t cog but after 50-60 miles was ok. As has been said, adjusting the "B" screw to "wrap round" the cog a bit more helped with mine...

Woosh do a 48v 250w certified motor with a 17a controller (by my calculations peak input power 816 w at 48v, more when the battery is full) https://wooshbikes.co.uk/?hubkits#dwg22c-48v-kit I think this is optimised for heavy riders / hill climbing ability (IE high torque winding)

At your weight any electric bike 36v or 48v will very easily cope with that !

Can you tell us your route - I will look to see the maximum % incline - to be honest at 74kg you are likely to fly up any hills with any of the options you are considering

Yep. Also when I got mine Woosh fitted a new rear cassette on the wheel before they shipped it for a small extra charge, to make the install even easier. Fitting the bottom bracket torque sensor isn't difficult - the most difficult bit for me was getting the old bottom bracket off, but any...

any of these any good ...

@saneagle might be able to advice if this is a sensible approach

I'd be suprised if you can resurrect the battery - I wonder if you could bin it and fit a standard downtube 36v battery (and get a bit more range) and use the existing connections to the motor and controller ?

Do you know if the battery on the bike works ? have you a photo on the battery charge port ?

Just to say I have used the Woosh XF08C 36V rear hub kit - it was brilliant (my niece, a medical student has "borrowed" it to get around campus) and will get me (100kg) up most hills with a bit of pedalling effort, although it's not quite as strong as the 48V Bafang G020 / H405 kit but say the...

a 36v battery will charge to close to 42v when full and will discharge to close to 30 volts when empty

I bought the 48v bafang G020 (h405) rear hub wheel , winding code 12 which came with 250w stickers which I have dutifully stuck on. This was a 26 inch wheel. It seems a good balance between speed and hill climbing ability, especially with the 26 inch wheel. I paired this with the Woosh bottom...

Another example - is the Bosh rear hub h400 series, the current version is the h405 - it is rated at 250, 350 and 500 w (usually but not always, depending what voltage you are running it at :36,43,48) https://www.bafang-e.com/en/products/motors/hr-series/h405...

That's the hill of satisfaction - you get happier as you get older (according to that theory)

They say happiness over time is a U shaped curve