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That looks OK, I thought it was worth asking/checking as i've had that problem myself.

I would check you have clearance on the chainstays as those knurled bearing holders can sometimes have the effect of increasing the size of the motor you need. Although the BB is only 70mm you may need to add the extra 10mm width of the bearings each side to get the required clearance. A photo...

Have you tried asking Oxygen?

I've not tried it, but you could prob. rewire the one you have if you can open the throttle casing if you wish to keep the connector.

8 fun is Bafang who use Higo connectors which are wired differently. You may have trouble finding a L/H 108x with a Julet plug.

Contact Jimmy at eBike Batteries, he should be able to rebuild your existing battery with new cells and increase the capacity to 14Ah for around £300-£350.

I don't think Oxydrive is anything to do with Oxygen ebikes.

You could repair the threads with helicoil inserts. I've used these cheap kits many times for different jobs, always done the trick. https://www.ebay.co.uk/itm/Helicoil-Thread-inserts-set-Kit-M4-0-7-Set-Tool-Thread-tap-Durable-Practical/124293714234?hash=item1cf07b913a:g:qqYAAOSwAG9fMcOO

It could be that your wife's bike uses speed control in which case it would run at full power more of the time even when being ridden in low PAS level. It would depend on the speed she was travelling at.

KT display will only work with a KT controller. I think your kit may have Higo connectors, not Julet, which are wired differently.

You need a freewheel tool to remove the gears, but one with a 14mm hole in the centre, most dont. The DNP one fits. https://www.ebay.co.uk/itm/DNP-Epoch-Freewheel-7-Speed-11-28T-Nickel-Plated-ebike-electric-bike-rear-cog/153940187855?hash=item23d78cdacf:g:dLcAAOSwAtFexTPS

Depends what you want/need from a display. The 961/965 are quite basic, with 5 levels of PAS. I think the rest offer 9 levels. The smarter colour DPC-18 has a usb port for phone charging if that's your thing. There is also the Egggrider which is a very minimal display with various functions...

Holland bike shop list a Bafang TS BB, I'd check if it's compatable with your controller...

I can only see a 48v 17.5Ah rack battery on that listing. The limited info on the ad suggests that it's not a very good match to your motor as it will only supply around 20 amps.

If you have already ordered a battery, you will have to match the controller to the spec of that. Normally you would match the battery to the controller. Do you have a link to the battery you ordered?

If the bike runs fine on the flat at low power and only cuts out on hills on higher power levels, then as said, it is most likely the battery bms cutting the power. There could be several reasons for this. If you don't have one, buy a cheap DMM which will help diagnose the problem...

Both the 48v 14.5Ah and 17.5Ah packs contain decent branded cells and are more than capable of powering the 500/750 watt tsdz2 drive on a 15 mile round trip. If your budget allows I would spend the extra $40 and go with the 17.5Ah.

No sorry I don't. AFAIK the TranzX system will only run on an OEM battery. If you had the old one you could look at recelling. How old is your bike?

Holes=no magnets=new pas disc required.