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No you shouldn't be faced with silly money excesses , expect at most about £35 if you are unlucky.

What you pay on duties you won't know until the final bills come in, you will be informed up front of any extra duty as customs don't often release until the fee is paid or the courier won't deliver until it is paid. Expect a handling fee of £12 or so as well on top.

Ciclotek in Spain sell kits and KT controller accessories, if you are not happy buying from China direct then they might be an option. All KT can have a throttle added, for PAS the best option is two part sensor & disc set up they are less trouble some then the al-in one's.

Keep an eye on the usual online markets where it might be sold, ebay, preloved, gumtree and a few others. Chances are it won't be found or seen again.

By far the best after market controllers are KT brand with a choice of about a dozen lcd displays to choose from. Some wire soldering will likely be needed.

Show us a pic of the PAS set up.

That controller say's it's a dual voltage 24/36v one so their is no issue to worry about.

No mileage at all if one bricks the BMS, Bosh BMS must be kept live all the time otherwise it is scrap.

The six thin motor wires are the hall sensors, the white one being the internal speed sensor. One would simply match the colours to the KT controller wiring. Red, Blue & Orange you may have to try and trace the wiring, they could be for brake sensors ? If you disconnect them you could test...

As vfr has said the best option is to discharge the high cell group down to that of the others and then carry out a balance charge, leave the battery open so that all 10 groups can be checked for balance when done. Don't leave the battery to charge without being there to keep an eye on it.

It will work if the charge connection is the correct fitting.

Bosh don't sell mid drive kits for conversion and if you could get one the 3K bike would be cheaper to buy.

No.

No you won't fry the controller as the 5v flow comes form the controller and not to it, all that may happen is the hall sensor in the peripheral part may be damaged. Throttles with a Julet if that is what your controller has fitted can be got form many sellers (more so on AliExp) or other well...

Is it a case that the Black two pin connection is being connected incorrectly polarity wise hence the fuse blowing ? If the Black connector is for the battery either cut it and hard wire (solder the wires direct) leaving just the XT as a fly lead form said battery. Show us the actual battery...

For the cost of Rolhoff as you know, one can buy a good new hub bike.

Bafang use Higo connectors 3 pin yellow, to confuse things Julet also make a very similar connector and yes it is yellow 3 pin. 3 pin yellow can be used for PAS, throttle or speed sensor. The two makes Higo & Julet are compatible fitment wise BUT the wire sequence is different so you can't use...

The AKM128 is just a hub motor, it is the controller designation that determines how the power is applied. Cheaper controllers like Brainwave all appear to use speed control not to everyone's liking and can be too abrupt on starting and varying max speed limits in each level. Lishui a better...

It is what I do, if I need to nip out for an errand or a 10/15 miler then the battery has plenty in it.

Does this help at all ? SRAM Exchange Kit Dual Drive 3 DB XL (sjscycles.co.uk)