Category Archives: QS Motor

QS Motor and Sabvoton 12Kw-16Kw Setup

QS Motor and Sabvoton = Electric Motorcycle Performance 

The Race Bike I’ve built for the track, specifically Socal Motorized Bicycle Racing consists of these parts.

EDGE Race Bike

  • White Enduro Frame
  • Motoseat
  • Marzocchi 888 Fork
  • QS 205 V3 4T
  • Sabvoton 72V150A
  • Cycle Analyst V3
  • 16″ Moped Rims all around
  • Heidenau K56 16″ x 2.75 Moped Racing Tires
  • Shimano Zee 4-Piston Hydraulic Disc Brake
  • Shimano Rear Hydraulic Disc Rear Brake with cut-off
  • 203mm Rotors all around
  • 2 sets of 74V Hobbyking Multistars 16AH Packs
  • Icharger 406 Duo (70A charger allows for 30min-1hr recharges)

QS Motor V3 205


The QS Motor that I used during the race was honestly a bit slow, that is because QS did not send me their fast wind motors, which would have allowed me to hit 55mph instead of the 50mph which I was hitting. However, torque and acceleration was very quick. 0-40mph took only 3.5sec and that is without a good launch.

The QS motor when paired with the Sabvoton controller is a match made in heaven. Both QS and Sabvoton companies have a close working relationship together and it is no surprise that the two systems work together in harmony.

The QS motor is quite an impressive motor weighing in at 30lbs, lots of copper mass, and aluminum stator. 50mm wide magnets, this motor does not mess around, and can take quite a beating even under track conditions.

Recently I was able to hit 60mph and later even 70mph on this motor at 116V and the motor was barely warm.

As you can see the QS Motor when paired up with the Sabvoton controller is a very potent platform for some serious performance.

Sabvoton Controller

Although designed as a electric scooter controller, it has found its way into high powered e-moto builds.

E.R.T. carries the latest generation of Sabvoton Controllers that are Current Unlocked, Fully Compatible with the Cycle Analyst V3 Display, Variable Regen, and Temp Protection.

The Sabvoton Controllers come in two different cases, the SSC which is a squarish case, and the SVM which is the rectangular case.

The SSC case allows for a larger aluminum heatsink, which should allow the controller to be run at higher power levels for a longer period of time.

E.R.T. carries Sabvoton Controllers in two Flavors, bare in mind that all our controllers are current unlocked so the 72V150A could be run at 200A for 16Kw. The 96V100A could be safely run at 150A.

Sabvoton 72V150A – 95V 200A Max
Sabvoton 96V100A – 116V 150A Max


Installation and Configuration 

Pairing up the Sabvoton and QS motor is quite easy, all the connectors are matching and are plug and play.

Unscrew the bolts on the Sabvoton controller, and screw on the marine lugs from the motor harness to the Sabvoton Controller.

Plug in the hall connector from the QS motor to the Sabvoton Controller.

Wire up the 2 wire Ignition wires to a key switch or a on / off switch. Additionally you can short them together but you would have to unplug the battery each time to turn off the system.

Connect the Cycle Analyst to the CA connector on the Sabvoton.

Plug in Battery and Turn on Ignition

The System should fire up now

All QS Motors when purchased with the Sabvoton Controller is pre-programmed prior to shipping out.


QS Motor Tech Information

QS Hub Motor Tech Info

QS motors are one of the most powerful hub motors available today, I have extensively tested and raced these motors and boy are they powerful. Whether tearing up the dirt trails, blasting down the street, or ripping up the track. This motor can take it, and does its job willingly.


QS Motors are produced in Quanshun, or Taizhou China and the build quality is very high. The latest QS motors are the successors to the legendary Cromotor which was the previously the king of Hub motor performance. Now, there is a new king on the throne.


The QS Motor is a relatively heavy hub motor, weighing in at about 29lbs before the rim is added. This leads to unsprung weight in the rear wheel, which is fine for street riding but handling suffers especially during track or trail riding. You can negate this somewhat by using a long travel rear shock and lacing the motor to a smaller diameter moped rim and moped tire. This will improve traction and durability as the heavy motor will overwhelm bicycle tires and prone to flats.

Technical Specs

  • 205 Magnet Height
  • 50mm Magnet Width
  • Aluminum Stator
  • 0.35mm Laminations
  • Brushless Hall Sensored
  • DC Motor
  • 150mm Shoulder Dropout Width
  • Temperature Sensor
  • Dual Hall Sensor Sets
  • 10AWG Phase Wires