I swapped the motor on one of my Fluid freeride Horizons with a T9/zero 9/apollo city motor and it's been great so far. Speed went from 22 to 29 on flat ground, up to 33 on a slight down hill with a lighter rider and the pneumatic tire gave it a lot more stability and braking power (one rear brake on this scooter) not to mention the added hall sensors improved the throttle control significantly.