Bionx System

[overlander]

Was just looking at the system on the trek and have a question. I believe it senses the torque you apply, but where is the torque sensor. I was under the impression that it was on the crank but i see no wiring, so out of curiosity how does it actually work?

 

[Tex]

On my kit it is located in the motor-hub. I think this is true of all thier systems.

 

[Elcycoltd]

The torque is measured via the deflection of the rear wheel spindle. This is why it is important that if the rear wheel is removed it is then torqued up to the correct setting when refitted or the sensor will not function.

 

[Rab C Nesbitt]

The torque is measured via the deflection of the rear wheel spindle. This is why it is important that if the rear wheel is removed it is then torqued up to the correct setting when refitted or the sensor will not function.

Hi
Would that be a problem when refitting the rear whel after repair of a puncture or tyre replacement for example or is it just a case of getting the bolt as tight as you can ?
When you said that it should be torqued up to the correct setting I had a vision of a specialist bit of "torque" kit

 

[Nick]

I just tighten the back wheel up as normal with a standard ring, open ended or socket spanner and haven't had any problems or noticed any differences in torque sensing.

 

[Rab C Nesbitt]

I just tighten the back wheel up as normal with a standard ring, open ended or socket spanner and haven't had any problems or noticed any differences in torque sensing.

OK Nick - thanks for the reply and I see that you're a long time BionX user so you've been there and got the t-shirt !

 

[Tex]

I just tighten the back wheel up as normal with a standard ring, open ended or socket spanner and haven't had any problems or noticed any differences in torque sensing.

Ditto with mine

 

[Andrew harvey]

On the left hand side of the motor there is a flange on the shaft with a tourqe stay/peg, this is normally set for deraillier type drop out that are set an angle. If you were to use a frame with horizontal drop outs you have to free this flange with a puller and realign it for the torque sensor to work and then retorque the wheel, The snsor is inside the wheel and has to be vertical to work properly.
In practice it rarely needs to be reset once the bike has being built.