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  1. #1
    FOG
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    What is 520 tubing

    I have been to Reynolds' site and it defines several types of tubing, including 525, but a fair number of bikes have 520. What exactly is 520? The ads for 520 bikes talk about it being butted. waht is the extent of butting on 520?

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    hors category TandemGeek's Avatar
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  3. #3
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    520 is a 4130 chromoly steel, with double butted main tubes and (possibly) plain guage stays. It is found on budget tourers and quality hybrids, plus a few track and CX bikes generally in the sub $1000 range.
    The butts are designed for TIG welding, so are a bit thicker and shorter than on 531.
    Reynolds tubes are often available in different diamters, cross-section shapes and butting profiles, the number just refers to the material.
    Orbit cycles reckon it's heat treated, but I think that is a misprint.
    Last edited by MichaelW; 05-29-03 at 11:33 AM.

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