NOTTNICK

All advice appreciated. I have ordered a simple PAS kit on Ebay for £7. I think the sensor might just swap over although I will need to rig up some solid / waterproof cable connector under the Bottom Bracket as there is no way I can get access to anything like a controller unit. I'll see what happens. Thanks

That sounds like an excellent plan. Are you able to advise further please. Looking at the design of the cabling etc. It looks like I'll need to cut the current wiring on the Bottom Bracket and add a connector anyway.

Hi thelarkbox. I am sure it is the sensor now. It did get knocked badly several months ago when the chain got tangled up. It sounds interesting what you say about the pattern though. I shall swap over the dynamic rings just to double check that there isn't a magnet that has dropped out. That is the only part I haven't swapped in trouble shooting. Assuming it is the sensor, are replacements available? I am sure I won't get the same type (or will I?). If they are fairly generic in how they function, I am sure I could find a way to get something else to fit. I have no idea where to look though - any suggestions as to where to go?

My wife has a rear hub motor. It has started cutting out after I stop and it sometimes takes quite a long time until the motor kicks in, a particular problem on steep hills. I have the same setup on my bike (larger wheels). I have swapped the controller units over and also the batteries but it is still happening. The wiring look looks OK, I can't see any damage. The sensor on the bottom bracket that detects the chain ring motion took a knock about a year ago, but I have checked it over and it is running close to the magnetic ring. It is strange though that this is intermittent and only after stopping. I think the motor is a Bafang, or a Bafang clone. Our bikes are now getting on a bit but we love them. My question is: Is this likely to be a motor problem? Or a wiring problem? Has anyone else experienced this? Any suggestions? Thanks

I have had some excellent support from your 'esteemed pedelecer' Nealh just now. I had contacted him via personal message as he had helped me last year on this forum so it didn't appear on this discussion page. I would like to put it on public record what a great site this is for support and publicly thank Neal for his valuable help. Nick

It looks close enough. My dropout width is more (147mm), but I have a lot of spacer washers (see photo), so I am guessing that they probably are the same. Hard to measure exactly with spokes in place, but I get 127mm spoke hole and 140mm flange, so it may be I need a new set of spokes although 1mm may be well within tollerances. If you want to contact me via the link on my web page, I shall reply and we can sort out payment / postage etc. Cheers Nick

THis sounds like it really is a goer! I look forward to seing the pictures, but am pretty confdent it will work out. The wheel builder is very helpful too, has built quite a few motorised wheels. If it's all good we'll need to sort out how we do the transaction etc. Would it be more secure if you emailed me? Rather than post email addresses online - I have a contact link on my website. Do you want to use that? https://manorview.weebly.com/ Cheers Nick

More: I have just found a local wheel-builder who is happy to do this for me. So it looks like all I need is a motor. It's looking more hopeful.

That's helpful, but I don't know where to go from here. I have looked online and can't see any 29" wheels with motors that aren't from China (long wait for delivery), that would be easiest of course. I am also finding it hard to locate a wheel builder. I may have found one, but he would need me to supply spokes (not a problem if the replacemment motor is the same of course as I can measure what I have already). However, I also can't find any motors! They too all seem to be in China! So I have drawn a dead end here too. Do you think your motor woud do the job? If not, are you able to point me in a useful direction? I appreciate your help here. Cheers Nick

I know this is a freewheel hub, but I could get a cassette if necessary.

Here's what I have:

That looks interesting. I'll locate a wheel lacer and let you know very soon. The motor looks similar to mine. I'll sort things tomorrow. Cheers

Just to be clear, you suggest getting a replacement hub motor and get someone to build a wheel for me using my current rim.