Bmc all are gears motor. my believe is a Non - gear motor will be more reliable and much harder to die. The simple HUb motor without gear doesn't show it weakness in power and troque . It has good power, pick up, speed. i think my hub motor of 48v 1000w is hard to die, no worry of gears has expired and need to replace the internal gears.
Conhis hub motor run on April 2010, 48v 1000watts hub motor distance run 5800km, and Re~alive cyclone kit bought in year 2009, Bought a greentime controller 18fets- 4110 , 48v~ 90v , 3-speed mode. Latest top speed I got for my greentime controller 76.8km/h ! , yet to reach 80km/h, or I will never reached 80km/h ?