there are many differences between the Carrera and the Rio MTB:
- fork: the Rio has much lighter RST 100mm Omega fork compared to the Carrera 75mm Suntour SRNVX
- crankset: the Rio has modern light and strong GXP crankset with external ballbearings, the Crossfire has old style square taper.
- battery: the Rio has 13AH or 17AH, the Carerra 11.6AH
- motor: the Rio has larger motor.
- controller: the Rio has 17A controller, the Carerra 15A
- LCD: the Rio has 5 assist levels, with user settable profile for each, the Carerra has 4 fixed levels.
- the Rio has a throttle, lights, bell and mudguards.
Regardless of hill gradients, you have to keep pedaling with the Carerra, more if the hill is steeper, you pedal as much as you like with the Rio.