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If it worked before and not now I wonder if you bent the derailleur hanger, Is it hanging down straight? There are some great videos on youtube about setting your derailleur.

Got another saddle bag to try. https://www.ebay.co.uk/itm/Roswheel-111363-Waterproof-Bicycle-PVC-Saddle-Bag-Cycling-Accessory-Black/202092167393?hash=item2f0da1c0e1:g:-KsAAOSwke9Z8EOe This one only just holds 10s 8aH or 12s 6.6aH multistars. Looks a bit neater than than the larger bag if 8aH...

A nice neat build. I wonder how many people will spot where your controller is.

Also, it's a 48v 201rpm motor running at 48v, so it might be getting near it's max rpm.

Assuming you have checked the speed cutoff setting is higher than 25kph it might be setting P1 as @Nealh mentions above. Also check the speedo displayed against a gps mobile speed app to help with setting P1

Looks good. Battery hidden in that top pannier bag is a great idea.

Don't want to take this thread off topic but Halfords currently have KMC Z8S chains on sale for £5.91 click&collected. (less 3% through topcashback too)

Hypoid90 being as thick as it is, would it be possible for it to not get into the inner workings of the links where it's needed when squirted on? I left my chain soaking in it for a while and as you say it is very good and long lasting but am going to try squirting it on soon and am thinking it...

The quality KMC X8.99 chain still skipped with a second derailleur so swapped it for a cheaper KMC Z8S and problem has more or less gone. However it still skipped at first until I flexed the chain about and span the pedals rapidly in all gears (basically loosened the chain a bit). Result

Even if you spin the pedals backwards?

I got a cheaper derailleur, a Shimano RD-M310 today. Funny you should mention the b-screw, I noticed this one had the screw fully out when new whereas the other derailleur had the b-screw fully in when new (which I left at that.) This M310 has larger jockey wheels for some reason so hope it is...

I ordered a set of those and they arrived today just as you've described so probably the same ones. Will let you know how good they are in a year or so when I need to change them. 10 packs like this with a seperate pack of spring things @ £1.49 per pack

I'm sure there's supposed to be cable ties wrapped around the complete build to keep the contacts tight against the cells which may help with any contact issues.

Nice neat battery. What hydraulic brake sensors have you used?

I still think it could be the chain being too new/stiff. What I will do is order a slightly different derailleur,a Shimano RD-M310 If the chain still jumps I will put a cheaper chain on and let you know which has hopefully sorted it.

I've had to take the rear derailleur off this bike already to use on my daily commuter after a catastrophic derailleur disaster this morning so need to purchase a new one. Since I had chain jumping issues on this bike can anyone recommend a rear derailleur which definitely works well with the...

Ordered one to try out. The resistor I mentioned is shown on the ebay pics connected to the 2 inner wire connectors but I think I understand it now, that is showing the load and the power to the 2 outer connectors. Does it actually cut the voltage supply off when lower set level is reached?

How do you set the voltages? Also one of the pics shows a resistor between the 2 inner connections, is that needed?

Looks a good stealthy conversion. Is your battery in the saddle bag? I wanted to use that idea but being too short I can't raise the seat high enough.

There's also Jimmy at bga-reworking could spotweld a battery together in a saddle bag.