Tyre marking

Discussion in 'Cycling Equipment' started by citrinella, Mar 22, 2007.

  1. citrinella

    citrinella New Member

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    Could someone please explain how tyre marking for bicycles works. It certainly isn't like tractors :) Tractor rims are measured in imperial units, most modern tyres have width measured in millimetres. A 540/65 R 38 tyre is nominally 540 mm wide, has an aspect ratio of 65 (tyre height is 65% of it's width) and fits a rim 38 inches in diameter.

    When I look at my mountain bike, the measurements given on the side wall are reversed - 26/2.1. I guessed that would mean 26 inch rim, 2.1 inch wide.

    Nah - the rim is only 22 inch diameter.

    So, I was looking for a S/H hybrid / road bike with wheels something like 28/ 1 3/8ths to cope with Edinburgh's cobble stones. Now I guess that is fine, except the first bike I looked at had no sidewall sizing ! but 24" rims, looked like 1 3/8ths to me.

    Obviously no sidewall markings suggests the cheapest of the cheap. Probably reflects on the bike (which was originally bought in Oz). However, I'm a curious type and I would like to understand bicycle tyre marking.

    Cheers, Mike.

    P.S. I notice a lot of talk in metric sizes. I can cope with metric or imperial explanations, thank you :)
     
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  2. sogood

    sogood New Member

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  3. citrinella

    citrinella New Member

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    Exactly what I was looking for thank you. Much easier in ISO, and I would like 35-622 or 38-622.

    Cheers for this, Mike.
     
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