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No US bike will be 250w or EN15194 complaint. Also you need to find out the US bike tariff and look it up on the HMRC imports page to see how much the import tariff will be, then add vat to the total price.

From the face of the BB shell you need 65mm from center line of BB to the chain stay, as indicated by the Blue line I inked on your pic. This is just for the final drive casing that will need to sit hard up against the BB shell.

Sounds quite terminal for now and sounds like an internal drive gear/drive may be damaged , firstly though check the motors final drive gear. Remove the crank arm/chain wheel to unscrew the cover and take a look at the main final drive gear and pinion drive, esp check the small pinion drive to...

What type of motor drive hub or mid drive ? Just seen your other post BBS01.

I you want throttle option it will cost about £35 for new Lishui controller and basic meter display.

Yes. The reason to fit a cut out is to stop the motor, when a throttle is fitted if it malfunctions then the motor will go full speed/current. Without a cut out if you try to stop just using brakes the controller will blow at some stage/ sooner then later.

There are five hole spider adapters for 104 & 130bcd chainrings, 32t/42t or 44t is as low/large as you can go for warranty though chain line will be compromised. You risk stripping the Blue internal drive gear with the 50t set up but there is a brass replacement available which may allow a...

Road bike levers will be/ are a harder solution to fit cut outs to them & make them look nice when fitted, only one cut out is needed and rear lever is best utilised as it frees rh for signals.

Are there any other unused 3 wire connectors ?

You need a Lishui brand controller. The ony ones I see for sale are controller and lcd combo. There are Julet or Sm connector controllers of 14 or 22a rating with choice of lcd's the cheapest combo are about £34 inc delivery. Browse all the pics to see the connectors...

It is a dealer data programming cable looks like you might have Luishi controller.

Most lcds are only compatible with certain controllers, if you are getting another G51 with a no brand controller then they as a new pair are compatible, it is likely they will be compatible with your current G51 set up. On the other hand not heard of that particular make over here and they...

In this situation Wheeliepete would advise the delicate use of his lump hammer :p.

What is SMMl ?

Mid drives are voltage dependant with internal controllers either 36 or 48v, though you can go 14s with 48v.

If they are speed sensor connect R/R, Blk/Blk and Blu/Wh on the controller hall plug. The speed sensor uses a hall to detect the magnet and the other two are just for power.

Most controller to lcd wiring uses a trunk style cable 1T4/1T5 so finding any wire fault is tricky but you can test each pin out for a wire break by using continuity test on each pin out at both ends. If the lcd is faulty then replace, opening is all but impossible as sealing up again but it...

E10 say's it is a receiving comm's error, so the fault sounds like it is on the Green /rx line between the controller and LCD. Fault can be either or possibly a wire fault. Double check again the Green/rx wire connection on the controller/lcd wire connectors, if Julet pin type make sure pins...

Your maths is correct 13ah x 48v = 624wh, that is the total battery discharge capacity if you were to drain it to 2.8v per cell. but this isn't feasible as the BMS will stop discharge below 3.2 - 3.3v per cell. In real life use the wh quoted will be less. The actual wh per mile usage will differ...

For 60 miles 15ah might do it but doubt it unless you use low power only. Use a normal household digital plug timer that tells you kw/h input/output.