killerisation
1 mW
- Joined
- Jun 27, 2018
- Messages
- 19
I'd like to add a motor to my tandem.
At present I only want pedal assist, ideally this would be controlled by a torque sensor.
We still want to ride with other non e-tandems sometimes, so it can't be too noisy.
It would be nice if it looked stealthy too, but that's not so important.
My initial plan is to keep both sets of cranks (which are square taper) and replace the front BB to a torque sensing one, add an additional chainring to the rear non-drive side and allowing the geared motor to drive that. The issue here is the motor would have to operate the 'wrong' way round so the freewheel would have to be mounted backwards. Is this hard to do? I guess it depends on the motor. What would people recommend? I'm considering a cyclone, not sure what size yet.
My second plan is to mount a chainring to the torque-sensing bb and connect the motor to that in the conventional way, however I'm not sure about whether its possible to set up the control system to work properly, as pedaling harder would result in the chain tension decreasing.
My third plan is go from a 3x to a 2x by adjusting the limit screws on the front derailer and use the motor to drive the unused ring. It'd be a shame to reduce the gear range though.
Any advice appreciated, especially if you've built a system like this.
At present I only want pedal assist, ideally this would be controlled by a torque sensor.
We still want to ride with other non e-tandems sometimes, so it can't be too noisy.
It would be nice if it looked stealthy too, but that's not so important.
My initial plan is to keep both sets of cranks (which are square taper) and replace the front BB to a torque sensing one, add an additional chainring to the rear non-drive side and allowing the geared motor to drive that. The issue here is the motor would have to operate the 'wrong' way round so the freewheel would have to be mounted backwards. Is this hard to do? I guess it depends on the motor. What would people recommend? I'm considering a cyclone, not sure what size yet.
My second plan is to mount a chainring to the torque-sensing bb and connect the motor to that in the conventional way, however I'm not sure about whether its possible to set up the control system to work properly, as pedaling harder would result in the chain tension decreasing.
My third plan is go from a 3x to a 2x by adjusting the limit screws on the front derailer and use the motor to drive the unused ring. It'd be a shame to reduce the gear range though.
Any advice appreciated, especially if you've built a system like this.