I am looking at getting a Garmin 305 for my '03 Trek 7500. The concern I have is about mounting the speed/cadence sensor. My current cadence sensor needed a fair amount of shimming to get is close enough to the crank arm magnet. As I understand it the sensor on the 305 is an all-in-one unit with a little arm that stick out to track the spoke magnet. I'm concerned that as I shim the sensor body away from the spokes (and toward the crank), the sensor arm won't be long enough.
Anyone have any experience with this type of setup?