> If there were
significant unreliability issues you'd have thought they would be using
an alternative by now?

Sure. I don't have a good explanation for my experience with them, other
than that rolling snake-eyes multiple times can happen.

Other bike-mounted gadgets seem to last - Ancient Magellan Blaser 12
(GPS), B&M headlight & dynamo...

I'm thinking about an accelerometer-based power-tracking system - This
needs to track wheel rpm as well, so I'm going to experiment with Olin's
idea. Reed switches are certainly a fall-back position.

Jack
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