Hello this is my first post so excuse me if i am posting in the wrong topic or else.
This is my take on Madbricks brushless xl motor conversion, but i changed a lot. most importantly instead of extracting a gear from the origenal motor i just used an rc gear what you want is a mod 0,5 12tooth gear. This enables me to use a motor with 3,175mm shaft i choose a The "Novak Three-80 Micro Pro Brushless Motor" because it is sensored so instant tourqe (side note it is 18 years old so you cant buy it). the power is stupid it can twist axles from 0 rpm the rpm is simular to a buggy motor. to connect all together i used a 3d printed housing that replaces the rear section of the original motor so it is fully reversible to a stock motor. if you have any question feel free to ask.
sorry for the shit quality had to compress it fo fit in the file size limit