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If the larger chainring enables you to pedal faster downhill, and in consequence the kinetic energy carries you further along the following flat of up the following hill, you will save a bit of battery content and slightly extend your range. By contrast, an undergeared e-bike can be very...

Don't think of a larger battery as an opportunity to charge less often, lithium batteries are cyclic, that means they like to be constantly used and recharged. Always emptying them before charging just shortens their life. The reasons to have a larger capacity battery are mainly longer range...

I like torque sensors for climbing, pedal input will be high then so a torque sensor is easily able to deliver the power needed. I think Jackhandy meant a torque sensor is best for distance mainly because it's more restful than holding a throttle open for a long time. I don't think there will...

I like large chainwheels and to me a 52 tooth is perfectly normal for road use on any bike, including MTBs. On my last 700c wheel bike it gave me a top gear of 122 inches, allowing me to pedal up to 45 mph. On my 20" wheel folder I have a 60 tooth chainwheel giving me a 92 inch top gear and...

The trouble is often the law. If the cycle lane is bounded by a broken white line, it's advisory and it's perfectly legal for drivers to park on the cycle lanes. If the white separating line is continuous, the lane is mandatory and it's technically an offence to park on it. However, that...

My retirement country riding experience is the same. On virtually every occasion when repairing a puncture in the countryside, other cyclists have stopped or slowed to check if I need help, and that includes the serious lycras. The maximum I've ever had is four bikes, but each one has had it's...

Sad no other cyclists around to help. Like Zebb I've often got others out of that trouble. One thing that's often surprised me is those who have all the puncture repair kit but no pump. One group of three roadies with a puncture had three kits and the puncture repaired, but not one pump...

I'm not sure if that is "you wish" or you're just boasting! :D Sounds like you should leave hubby with his cabbages and hit the open road anyway.

I can only think of asking on social media online, it's possible that a cycling enthusiast in the engineering or CAD field might be inspired to dabble. One problem is that many of those interested in the cycling subject wouldn't be interested in the electrical aspect, so it may be necessary to...

Those old Powabykes had many strengths and a loyal following as a result. I'm not surprised you were charmed by its qualities. Powabyke make a trike as well, so maybe your husband could cope better with that at moderate speeds.

Yes, that is correct. The only problem with a pivot ahead of the BB is that it may enlarge the fold a little on a practical design. But the rear of BB pivot is still acceptable for belt drive in the way I described.

In answer to your points: 1) I don't know the patent situation with the Brompton rear fold, but since many others use it, for example Birdy and Ori, there may not be a problem. 2) I don't think belt tension is a problem. If the pivot is at the rear of the BB and slightly higher than it's...

Yes, the patent problem could well crop up. It wouldn't really matter if truly a home build, but asking professional engineers to produce something breaching someone's rights is a problem. I don't know of anyone who could carry out the CAD side for you. Costs can run away on a project like...

Brompton/Birdy style rear frame fold rotation can easily be arranged with the pivot around the bottom bracket. The pivot would be heavier since it would surround both sides of the frame bottom bracket, but completely practical. This would maintain belt tension both for suspension action and...

Yes, that's why I remarked it could also have rear suspension. There have been a number of folding bikes like this. If the swing arm pivot is centred on the bottom bracket, the belt tension would be constant.

This type of single rear arm frame for belt drive can be designed to be not "breakable" and use standard cycle components. Can also have rear suspension:

That's very good news, thanks for the information Andrew. :)

And the frame and sprocket combination is designed for a specific available belt length. That's why these belt drives are normally only seen on bikes designed for them.

Thanks for the explanation, your English is undoubtedly far better than my knowledge of your language, whatever that is! I understand now. If the hub motor has a standard freewheel thread, and most have*, I think a toothed belt sprocket may be available to fit. Not certain though, most are...