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It is not entirely clear, but it sounds to me like you may be planning to fix broken batteries as a business. My advice is don't. The consequences of one failure are far too high for it to be worthwhile, and there is no way you can mitigate the risks sufficiently. Generic batteries are so...

On flattish terrain with the rider contributing a bit and not trying to maintain 25km/h all the time, 25 miles will be fine on 360Wh. Range instantly increases when you slow down and/or pedal harder. In other words, the rider to a large extent determines range.

That's GoPro 10 number 2! I still have not tried your night time settings, must do before October.

In those lighting conditions I would be seeing this: So unimpressed with the camera! I wouldn't be happy with either of those overtakes, but at least the jay walker stopped!

It is easier than you think to replace a spoke or build a wheel. My two crutches of reassurance are (1) it does not need to be perfect in order to work and (2) spokes are thin and stretchy, rims are robust and stiff. You will not hurt the rim by getting the spokes not quite right. When you...

If it works then it works! It looks a bit hard on the chain in the bottom two gears from the picture. If you sight from chainwheel to cassette without chain, which gear does it line up with?

The Heinzmann and Xiongda are probably too specialised to consider here. Your hub motor suggestions may well do the job, but the OP really needs a representative test ride to know that. Without that, mid-drive is less risk because gears can be changed to suit, so a workable outcome is pretty...

If you can try out some bikes before you buy it will help you make the right decision for you. Friends? Romans? Mancunians? At minimum, a rear hub bike and a mid-drive, on the actual terrain you plan to ride, ideally heavily loaded. Comfort and controllability need to be assessed, as well as...

Six links is too many. Only half the increase in teeth is in contact with the chain. Use two or four, whichever fits best.

Try a few forum searches with likely BBS01 keywords, there is lots of info on here. Do you know what cadence you are pedalling at? The motor needs to be in its happy range.

Going down I'd be standing on the pedals, gripping the saddle between my legs and giving thanks for my air forks. Going up I'd be grumbling.

One of advantages of my setup is that when I camp at the natural end of the solar day, wherever I happen to be, most people are far too interested to question my right to be there, and the rest give me a wide berth as I am clearly too odd to approach! And I only leave flattened grass, which...

This is my third summer with this setup. My work pattern is 7 days on, 7 days off, so whenever good weather hits my off time in the summer I go riding. This will be 5 days, or 6 if conditions dictate, 300 to 350 miles. If you search the forum for 'solar trailer' you'll see some of my earlier...

Thanks for the tips and encouragement. Next wet day perhaps...!

My brain is not as agile as it was, I am frequently amazed at the ease with which you and others manage things that take me much time! When forced to choose and given good conditions, I prioritise building rather than publishing my archive of good bad and ugly!

Weather like yesterday, less than I used. Weather like today, far more than I need! I am self-sufficient in the middle 5 months of the year at 60+ miles per day average, and in the middle 2 or 3 months, average of 80 to 100 miles. Today, no time pressure, so 50 miles through places like this...

I'm getting just over 2 hours on the white higher spec GoPro 10 batteries at 1080p/24fps. Much less at 4K/50fps, which I have started to use on the best bits to improve my retirement archive!

I generally avoid them, but the road network up here does not always provide an alternative route, which makes driver behaviour all the more important. I would usually be on the opposite side of Loch Ness, on the route 78, heading for Inverness, but this time I'm turning off at Drumnadrochit...

The problem I have is that in Scotland it is not easy to upload video. We don't have Operation Snap here. It is a long, painful, drawn out process, and the number of incidents in the many miles I do make me quite selective to reduce my workload and that of the police too. The company concerned...

I hadn't realised how large the lollipop end was until those pictures!