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https://bafangusadirect.com/pages/quiz this will get you a nice template showing different offset sprocket options.

There are some great sites offering to do laser cutting of small pieces for a reasonable price.

btw if anyone reads this thread and would find the broken tongsheng casing useful for a similar purpose get in touch and I'm sure we can sort something out.

yes that would be the sensible answer! Whenever I’ve mentioned my ebike conversion in the local bike shops they’ve looked at me like I’m insane and acted like they want nothing to do with it! yes it was brave to cut down the bottom bracket, but it solved the problem. Took about 3 hours to get...

It’ll probably be ok. You could locktite the thread, or put a paint mark across the thread and the nut so you can see if it moves. I had the same on mine but I sawed and filed the bottom bracket tube down a few MM to give myself some extra threads showing. That was a pig of a job to keep the...

You can run that hydraulic hose wherever you like, it doesn’t have to come out of the bottom tube where it does. They’re easy to makeup new ones to a different length. On my bike it runs along the underside of the top tube and then down the seat stay to the rear calliper. You could fit rivnuts...

It'd be nice to get the panels on the bike somehow; I guess there are capsule shaped solar vehicles land speed record money no object things, but if you could fill the wheels and the frame triangle on both sides with panels that would be a decent area. Or put it on a massive gantry to sits...

that sounds nice!

Im sure something could be made from a charger cradle, stick it in a small frame bag.

i have a bbshd with a 17.5ah battery so my tank weighs 25kgs! I fancy building another with one of the 1.75kg bafang hubs and using batteries from a standard power tool, Bosch/MAkita, 36v 5ah. but to be fair it wouldnt make enough difference to be worth the effort/expense. once on the move I...

I knocked up a spreadsheet in excel: 1. Based on knowing the number of teeth on the chain wheel and the RPM of the pedals you can calculate teeth per minute on the input to the chain 2. From that teeth per minute, with the number of teeth on the cassette you can calculate RPM of the rear wheel...

So I can just pump 58v into the charge port continuously and the BMS will sort out the shut-off when fully charged?

Good point! Say 58V @ 500 - 1000 mA as a charge rate?

I have a new bike shed going in down my garden, could someone give a 'shopping list' with ballpark costs if I wanted a solar setup on the roof to charge my 52V 17.5ah battery? Happy for it to take as long as it takes to charge.

Great job! How’s it ride, what’s the range, any teething issues?

Looks nice! Since when was 48v at 12A within the 250w limit!! :eek::D

If you don’t like how the bbshd behaves PAS wise, then I think you’ll find the same with the bbs02 and the hub drives as they work in fundamentally the same way. TDSZ-2 may be your best bet, I think the crank axle issues are not as prevalent as you think. Would need to see some better pics of...

I’d probably for starters consider the same number of teeth as your largest chainwheel. You'll have the assistance of the motor to counter the higher gearing. The clearance should be ok as the motor will push it out to kinda the same position it is in now.

How many teeth do the existing chain wheels have? I did a spreadsheet for mine to work out the speed in each gear based on the rpm of the chain wheel. i geared mine for a max of 40mph flat out, I’ve software limited it to 25 so the top gears are a kind of low rpm/overdrive though. mine has 29...

Not sure it matters does it? Might as well have that one on there than a thinner one; it'll be the same strength if the same number of threads are engaged.