Originally Posted by
Panthers007
I would think that with a front-mounted sensor, if it were bumped it would have a much worse encounter with the spokes - possibly torn off and damaging spokes on it's travels. From the back it would just click the spokes like a baseball-card.
Only if you're backing up. On the pic you posted above with the sensor mounted on the rear of the fork, if the sensor gets bumped inward somehow, the spokes may snag it and/or drag it in further and cause damage. With it mounted on the front of the fork, you would tend to have the baseball-card effect in a similar bump-in. Remember, the spokes are normally traveling towards the rear of the fork and away from the front of the fork.