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Old 12-27-16, 12:46 PM
  #31  
noglider 
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Location: West Village, New York City
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Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1973 Raleigh Twenty, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem

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Originally Posted by kaos joe View Post
I can't add anything regarding the OP's question, but I can confirm that this phenomenon does take place. It occurred when I began mounting a second computer on my wife's bars on our tandems. Had me confounded for a few rides. I now splice the wires together, running both computers off of the output of one magnet/sensor.
Why does your wife want the computer, and do you both look at it and discuss the display?

I use ridewithgps, and it's probably the same in elevation reporting. When I ride over a bridge, it thinks I'm on the surface of the water, so it reports more descending and ascending than I actually do.
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