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It might be possible for CF bikes a mid motor is out as the BB build up of material around the ali shell is to larger unless the shell is push fit, then the material build up is likely to be too much. A possible option might be a small light weight front hub like the Aikema 75/1.2kg, the...

The two wire one is no use, it is likely for a brake sensor , only that three wire one is a likely candidate. Makers name of the controller, Lishui possibly ? Yellow is likely the signal with Black & Red logically being the Gnd & 5v, though a meter will tell you the later two.

Only if the controller has a unused/ spare throttle connector. You have to show us a pic of the controller and it's wiring in a way we can see all of it.

If it works then you don't need a new controller, just some controllers deliver power better in a more user friendly way.

Getting the right kit depends on what you want to use it for.

Charge the battery and then let us know the voltage by using a meter to measure it.

If it is a speed controller which it sounds like it is, they give batteries a much harder because they demand high current all the time. They reduce range by quite a lot.

25v is getting low 3.57v per cell group, 22.4v (3.2v) is about the minimum to go. If you see the same voltage in all power levels then it sounds like the controller is a speed controller which gives max current in all power modes with each one having a different max set speed.

If P2/5 works for you then fine, P2 1 or 6 is usually the norm. 48v is the nominal battery voltage its usable voltage is 40v - 54.6v, though ideally as as PC has mentioned 44v is a safer lower voltage per cell group at 3.38v.

All I can say is P1 is metric and imperial measurements probably both speedo and odometer.

The Crossfire doesn't carry out any special hand shaking so it should be ok. Others have have replaced the Suntour TSBB & controller with other electronics and continue to use the existing battery.

I believe 40 -45nm,

For load test using high PAS isn't enough as that is just a simple no load test, there is little resistance., You need to see how the voltage fairs by gently applying the brake at the same time to simulate the ride, try low and medium PAS as well.

Sag under load looks very good. How much load or PAS level ?

24v is your nominal voltage. The batteries are usable though depends which of the load voltages relate to which battery charge.

Are you mad ????

There quite a few controller options from cheapo to the slightly more expensive like KT. Buy all the parts from the same place or an electronics kit. You will need a new Bottom bracket to suit your bike I expect you will need a square taper one to use you existing cranks. You will need an LCD...

On another forum they say Cycle Republic are to be closed by parent company Halfruads as they also have Tredz bike on line who are in the same stable as well.

If the lipo is seriously going out of balance then the cells doing this will or usually have higher IR, all you can do is solder on a set of balance leads to monitor the cells. I charge my 5 1/2 y/o 29E's now to 4.1v and they are behaving. BMS deal with top balancing if the cells are within...

Your hub is a D/D hub so don't know why they are different, the phases are equal so no reason why they shouldn't be the same. Maybe someone else can shed so light.