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Torque v cadence sensors

Cadence/Speed Sensors

Cadence sensors turn the power on when pedals are turned forward and turn the power off when pedaling stops.

It will take between ¼ and ½ of a complete revolution of the pedals before the power is turned on.

Torque Sensors

Torque sensors recognise when and how much pressure is being put onto either pedal. Power will increase as the pressure on the pedals increases. Power is available immediately pressure is put onto either pedal.

The Operation of Wisper Cadence sensor and Torque sensor 

Standard cadence sensor

The magnetic disc can be seen on the standard equipment bikes, it is a part of the cadence sensor system and sits on the inside of the right hand crank by the bottom bracket axle. It simply tells the bike when the pedals are being turned forward at which point the power switches on. When a rider stops pedaling, the magnets stop passing the sensor and the power turns off.

Cadence sensor bikes require three magnets to pass the sensor in the correct order (pedals turning forward) before the power is switched on, magnets must keep passing by the sensor in or the power will turn off again. If the pedals stop turning, the bike will recognise this in a small fraction of a second and the power will turn off, hence the reason we do not need vulnerable brake cut outs.

Torque Power Pack

On Wisper bikes fitted with the Torque Power Pack bikes the torque and cadence sensors are housed inside the bottom bracket where the pedals are connected through the bike frame.

The Wisper Torque system works in a completely different manner to the standard Wisper. Through the torque sensor the system measures the pressure a rider is putting onto the pedals. Pressure on the pedals turns the power on and the torque sensor reads the amount of pressure being exerted. The more pressure a rider puts onto the pedals the more power will be demanded from the motor.

So… if the bike is starting from standstill, encounters a hill, a strong headwind or if the bike is heavily laden, the torque sensor will recognise that more pressure is being put onto the pedals and the bike will offer more powered assistance. It’s very simple and very clever!

Either the left or right pedal will activate the torque sensor.

The Throttle

All Wisper bikes have a “twist and go” throttle as a part of the left hand grip.

The throttle is set up to comply with European law, where it is only used for assistance when walking the bike.

HOWEVER….. If a rider twists the throttle and holds it open whilst riding (pedals turning forward) the throttle will override all the sensors and offer “assistance” up to a maximum speed of 15.5mph regardless of the amount of pressure being exerted on the pedals.


Tell me more about the Wisper Torque drive system

The new Wisper Hybrid Torque drive system is designed to deliver maximum power to the bike’s rear wheel smoothly, quietly and efficiently.

Because of the efficiency of the two sensors the range on a Wisper Torque is up to 30% greater than on our standard models.


Seamless delivery of power

The new Wisper Hybrid sensor cleverly splices information from the torque and cadence sensors, producing a seamless riding experience. Our patented software enables the controller, sensors and motor work together in perfect harmony, creating a seamless delivery of power.

increased range

The increased efficiency of the system means a rider can achieve up to 30% more range when compared to a cadence sensor alone.

More responsive

The combination of information from the two sensors coupled with the amazingly fast processing of data, ensures the new Wisper power system rapidly responds, to the speed of the bike and the rider’s input, and riding style, creating a very natural riding experience.

Quicker starting assistance

The benefit of the Wisper Torque sensor can most be felt when setting off, especially on an incline. The software in the controller will recognise that the bike is stationary, so when the pedals are pushed down the bike will know the rider needs maximum assistance to get them going. It very much feels as if you have twisted a throttle. When the bike gets moving the cadence sensor recognises you are on the move so will gradually reduce the power. The rider will not feel the gradual reduction, the whole experience will feel very natural.

Silent running

New sine wave technology coupled with the rear wheel drive, has the effect of making the new Wisper Torque system virtually silent despite it’s superb hill climbing capability.

Being positioned behind the rider any running noise from the motor becomes practically inaudible.

Hill starts

The system starts and stops within milliseconds of putting pressure on, or taking pressure off the pedals. This almost instant reaction has two major advantages:

Starting off on, and climbing steep hills becomes much easier. Maximum power is available immediately depending on how much pressure is exerted on the pedal, negating the need for a throttle.

More natural riding experience

Maintaining and controlling speed is far less erratic, ensuring the riding experience is safer and more natural.

Reduced wear on chain drive and gears

The four major benefits of the Wisper Torque rear hub system over centre drive systems are as follows:

Power is directly and efficiently applied to the rear wheel. This eliminates issues associated with chain stretch/wear and putting too much torque through delicate hub or derailleur gears.

Companies such as Shimano do not recommend that more than 35Nm of electronic power is put through their systems.

More power to the rear wheel

Our rear wheel direct drive hub system avoids the bicycle chain and gears, therefore, the whole 50Nm of available power can be directly applied through the rear wheel.

Better grip

Positioning the motor and battery at the rear of the bike keeps the weight directly over the rear tyre ensuring a more positive grip, especially in wet or slippery conditions.

Why should I choose a Wisper 700Wh or 575Wh rather than a 375Wh battery?

Firstly the 575Wh battery will give you nearly 50% more range than the 375Wh battery and the 700Wh will double your range. Most importantly the maximum power band is much longer, helping you climb those steep hills on max power.

The latest Wisper 700Wh LG batteries are installed with the very latest battery technology. These state of the art batteries have advanced soft ware that automatically assists in keeping a battery in perfect condition.

A 575Wh battery will on average last one and a half to two times as long as the 375Wh battery and the 700 almost three times as long. This is due to the stress levels put on the battery being much lower on the larger battery.

We guarantee our batteries will not lose more than 30% of it’s capacity within two years of purchase.  Consider that when a 575Wh battery has lost 30% of it’s capacity you still have a battery with a 400Wh, this will still offer assistance for longer than a brand new 375Wh battery, the same applies to the 700Wh battery after 2 years we guaranty you will still have just under 500Wh left.

In the long run a higher Wh battery is always cheaper.

The critical point regarding battery longevity is that the battery is topped up regularly and and never left flat for more than a few hours.

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