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  1. #1
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    Raleigh Cycle Computer help!

    Just last week I got a new Kelly's Axis hybrid bike, and yesterday I bought a Raleigh 16 Function wireless cycle computer for it.
    My problem is that the tyres on my bike (700x38C 40-622) are not listed in the instructions with a code to put in the computer...
    What is listed is:
    26.6" (700x25C) ------ 2124
    26.8" (700x28C) ------ 2136
    27" (700x32C) ------ 2155
    28" (700B) ------ 2237

    Is it possible to figure out manually what code my bike would need? I've tried with a calculator to look at the ratios but that doesn't really work.
    Any help is greatly appreciated. TIA.

    Cork-Spotters

  2. #2
    Senior Member
    Join Date
    Jul 2007
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    Melbourne, Australia
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    Giant CRX
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    Quote Originally Posted by Cork-Spotters View Post
    Just last week I got a new Kelly's Axis hybrid bike, and yesterday I bought a Raleigh 16 Function wireless cycle computer for it.
    My problem is that the tyres on my bike (700x38C 40-622) are not listed in the instructions with a code to put in the computer...
    What is listed is:
    26.6" (700x25C) ------ 2124
    26.8" (700x28C) ------ 2136
    27" (700x32C) ------ 2155
    28" (700B) ------ 2237

    Is it possible to figure out manually what code my bike would need? I've tried with a calculator to look at the ratios but that doesn't really work.
    Any help is greatly appreciated. TIA.

    Cork-Spotters
    The 'code' is just the wheel circumference in millimetres. To measure your wheel make a chalk mark on the ground and line up the valve with it. Sit on the saddle and walk the bike forward until the valve is again dead bottom - make a chalk mark. Measure distance between chalk marks in mm --that's your code.

    You don't really have to sit on the bike but I believe it improves the accuracy by a fraction.

  3. #3
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    Thanks for that, I've got it sorted now.

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