Three checks decide it, and most buyers only make the first. The case has to fit the frame, the rail has to sit where your bosses are, and the pack has to slide off again once it is mounted.
An MTX wheel is a wider, heavier-duty build aimed at high-power rear-hub conversions. It changes tyre options and load capacity — and changes nothing at all about motor power, battery voltage or how well the bike stops.
Yes, a correctly specified 52V battery runs a 2000W system comfortably. But the voltage on the pack and the wattage on the motor prove nothing on their own — the BMS continuous rating is what decides whether it keeps up.