Measure your roll out. I start by putting a piece of tape on the floor. Then I put my front wheel so the valve stem is at 6 o'clock and right above the piece of tape. I sit on my bike and slowly roll forwards in a straight line until the valve stem returns to the six o'clock posistion. Then I mark that spot on the floor with another strip of tape. Dismount and measure the distance between the strips of tape in millimeters.
Most computers allow you to enter a "custom setting" for wheel size. Use this and enter your three digit number. Computers that require four digits will need a zero at the end of your three digits.
Continue on setting the computer up until your done and voila'! A 29"er computer is born! I have a Cateye Mity 8 and a Trek digital Incite set up this way and they work just fine.
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