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  1. #1
    Junior Member
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    rookie question on how to program trip computer

    Just started cycling as cross training for running, bought Giant OCR3 and got a little Schwinn trip computer for it. But to program it, need wheel size, and I can't find anything on the wheel or tire that matches the list of sizes in the computer manual, eg, one of the possible sizes listed in the manual is 2024. How do I figure out what the size is from the info on the wheels or tire. I know when I get answer I'm gonna feel pretty stupid cause it's probably obvious, but gotta ask. Thanks.

  2. #2
    Senior Member 4SEVEN3's Avatar
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    2024 is the circumfrence of the wheel in millimeters. To get it accurately form your specific tire, roll the wheel on the ground. Start with the valve stem at 6 o'clock and mark the floor. Roll the wheel one full turn and mark where the valve stem is again when it reaches 6 o'clock. Measure the distance between the two marks and youll have your measurment. Youll need this measurment in millimeters.

    What size is your wheel/tire combo?

    Good Luck!
    John
    GT-R Pro Carbon
    Mongoose Cannan Elite
    Trek 4300 Single Speed Conversion
    1968 Raleigh Sport (made in England, 3spd, steel!!!!)

  3. #3
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    Makes perfect sense, thanks very much.

  4. #4
    Junior Member clementg's Avatar
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    i was wondering which wheel size to use if you are riding on different tire sizes for the front and rear. i currently have a 26*1.85(206) front and 26*1.5(202) rear.

    another pro rider told me to use the front wheel size, any clue? and actually there's no measurement stated for tire size 1.85, "206" is meant for 1.95

    using Cateye Mity 8

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