Esteemed Pedelecer
Nov 5, 2013
I am fitting a pas sensor and disk, I have read d8veh`s article on this, and I know it is quite simple.
I am fitting it on the left side, and d8veh mentions turning the sensor by unscrewing it, I do not think this one can be turned if required, as it has a led light on it.
I assume it is fitted with the led facing the magnet disc, or the led would be useless.
just wanted a bit of confirmation.

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Reactions: tommie


Esteemed Pedelecer
May 20, 2012
the Cornish Alps
I'm fairly sure he meant you to reverse the magnet ring, but check it works when you turn the cranks Forwards, before tightening everything up.

Deleted member 4366

You only need to swap the sensor to the other side of its bracket if you want to fit it to a Hollowtech crank because it needs to reach forward.On a square taper crank or Octalink, it needs to reach backwards as shown in your photo.

If you fit it on the left side and have a square taper crank, you only have to flip the magnet disc so that it rotates the opposite way to the arrows on it.