I tried the "whiteout on tire" trick on my floor at home. I got only 1465, which I rounded down to 1460 to make-up for wobble. I think I'll have to try it again later to corroborate my original results. Maybe I read it wrong and it was 15xx? There's a ride that I do which is almost exactly 40 miles on my road bike's computer. I figure I go with whatever setting that's close, do the ride, and then adjust accordingly (do the math, that is). That way I can be pretty sure that I'm off by only a fraction of a mile per 40 miles. Not bad, IMO. For the moment, though, I want at least a decent estimate. I was always lousy in labs at school... (guess that's why I ended-up in math/computers instead of physics ).

Anyhow, I'm having a little trouble with the computer. It's a Sigma Sport 1600 (I think that's one of Ullrich's sponsors -- don't tell Lance!) wireless. I had it working after some tweaking of angles and whatnot, and it was even working when I got to my elevator. But on my way back from a little ride around the neighborhood (grocery trip), it registered a grand total of 0.06km. What gives? The distance between components is well within the max of 70cm, but the line of sight is pretty occluded. Could that be part of the problem?