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  1. #1
    Commuter Ericx25's Avatar
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    Dec 2005
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    35-406 tyre size for computer setting ?

    I recently received my new NWT

    Now I need to set my bike computer but the manual is useless, it only shows the setting for 47-406 tyres which is 1590.

    What should the setting of a "Schwalbe Marathon slick 35-406 20X1,35" be ?
    I guess the only way to have a accurate setting is the trial-and-error method on a known distance, 1km or more.....

    Eric

  2. #2
    Senior Member GeorgeBaby's Avatar
    Join Date
    Aug 2004
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    Austin, TX
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    1986 Hujsak, 2005 Bike Friday NWT, 2007 Surly LHT, 2008 Robert Beckman, Thorn Nomad MK2
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    The setting is probably just your wheel circumference in mm (1590 is about 20in*25.4mm/in*Pi). So, just roll it out next to a tape measure, and plug in the length of a revolution.

  3. #3
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
    Join Date
    Sep 2004
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    London UK
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    1982 Raleigh Twenty Hotrod Fixie; 1984 Peugeot Premier Fixie, 2007 Merc Lightweight folder
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    yeah - use the valve as your start/end and then roll it one revolution in a straight line; Like a surveyor's trundle-wheel.

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