Now, even regular bike computers don't stay accurate because of tire inflation variation, air temperature, and just plain inaccuracies while calibrating the wheel size. However, the Garmin GSC 10 Speed/Cadence Bike Sensor
Mounting and setting up the unit was a cinch. The unit cleverly has both the cadence and the speed magnet arm on the same sensor. The arm is designed in such a way that you can twist it up and down without needing a screw driver to loosen it up. This is a big feature, since if things get twisted around on a ride somewhere you can fix it without getting out the tool. Checking to make sure that you got everything lined up is straight forward: you push a reset button and the LED blinks every time a magnet crosses the sensor arm, so you can tell whether or not you've got it right. The unit uses CR2032 batteries Pack
My biggest complaint is that mounting the unit uses zip-ties, instead of rubber bands or something less permanent. My experience is that zip-ties are prone to breaking off from fatigue, and of course getting snapped through abuse, and I'm unlikely to carry zip ties on tour. The battery cover is also in an awkward place and might require removing the rear wheel to replace. No big deal if you're not a cycle tourist, but still a pain.
All in all, it's a nice package, and I'm even tempted to get one for my single. I'll probably wait to see whether this thing survives the upcoming tour before I buy a second one for the single bike. Otherwise, first impressions are: recommended.
[Update: I just switched the battery, and it's been about 1500 mile per CR 2032]
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