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  1. #1
    Senior Member
    Join Date
    Jul 2004
    Location
    Knoxville, TN
    My Bikes
    2008 ANT Custom 29er, 2005 Independent Fabrications Club Racer, 2004 Specialized Langster S-Works, 2001 Litespeed Tuscany, 2004 Titus Racer-X
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    shimano flight deck average speed calculations

    Does anyone know how the flight deck computes the average speed?

    After reseting the trip timer, which resets the average speed, I get "off results":

    trip time: 1 hour
    trip distance: 17.5 miles
    average speed: 15.5 mph

    trip time: 2.5 hours
    trip distance: 40 miles
    average speed: 16.5 mph

    Both of these are off, one high, one low. Thoughts? Am I missing something mathematically basic?

  2. #2
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
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    23,105
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    Don't know for sure, but it looks to me like the Flight Deck doesn't count time for average speed when the wheel isn't turning. See how it compares with the elapsed time readout.

  3. #3
    Carbon Fiber Nazi!
    Join Date
    Apr 2003
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    Not sure how it works, but what I can tell you is that my new Polar 725 agrees with my Flight Deck on the same bike.
    2003 Trek 1000 (Ultegra front derailer, beater bike)
    2003 Trek 5200 (EC90 bars, USE Alien seatpost, Dura-Ace pedals)
    2004 Diamonback Apex (RockShox Seatpost)

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