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  1. #1
    Reputation: DJ_JonDoe's Avatar
    Join Date
    Jun 2012

    Help!! Trying to set up bike computer and my tire size is not an option?!?!

    The manual gives me a 26'' and 26x2.25 option and my tire is a 26x1.5. Just for a heads up, 98% of my rides are city pavement.

  2. #2
    mtbr member
    Join Date
    Sep 2010
    Have someone hold your bike while you align the tube valve on the front tire at the six o'clock position. Mark that spot on the floor. Roll the bike until the valve is again at the six o'clock position. Now mark that spot and take a tape measure and measure from mark to mark. Convert the inches measured to centimeters and input into your computer.

    Much more accurate this way as the data is real. I never use the manual numbers.

  3. #3
    mtbr member
    Join Date
    Nov 2011
    Right, and make sure you are sitting on your bike, carrying the gear you normally carry, at the tire pressure you normally run. All affect tire circumference. Also do it on dirt as opposed to pavement since that's where we ride.

    I have a 100' measuring tape, and rolled the bike 11 revolutions/about 90 feet as I recall, then divided to get the circumference.

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