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  1. #1
    Senior Member
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    Frame tubing question

    Adventure Cycling just came out with a short article regarding the LHT. In the article they state that the LHT is made with heavy 4130 CroMoly steel. I have a MTB (1987 model) that is made with CroMoly Plain gauge MTB frame tubing. Is this the same as 4130 steel? I would like to tour with this MTB if it is up to the task. I had posted this question on the Touring thread but no answers.
    2008 Surly LHT, 2005 Cannondale T2000,
    1992 Trek 790, 1990 Trek 970

  2. #2
    Senior Member sannerbikes700's Avatar
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    Yes it is. You are probably fine to tour on it.

  3. #3
    weirdo
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    I don`t remember whether 4130 is a type of CroMoly or the other way around. Either way, the names are pretty much interchangeable in standard bikespeak. MTBs make dandy tourers.
    Pics of Steel Mountain Bikes turned tourers?
    In a similar thread recently, there was an argument put out that straight guage tubing makes for a better tourer than butted- whether that`s true or not I can`t say, but I know I love my touring MTB, which happens to have a plain guage cromo frame.

    EDIT: Here`s the technical mumbojumbo- http://en.wikipedia.org/wiki/Cromoly
    Last edited by rodar y rodar; 07-19-09 at 05:26 AM.

  4. #4
    Old fart JohnDThompson's Avatar
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    "4130" is the ANSI designation for chrome-molybdenum steel alloy; nothing more.

  5. #5
    THE Materials Oracle Falanx's Avatar
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    4130 is the AISI, not ANSI (American Iron and Steel Institute, not American National Standards Institute) for a 0.3% carbon, 1% chromium, 0.25% molybdenum steel. Nothing more. It has become synonimous with 'chomoly' and vice versa the same way hook-and-loop fatsener and the tradename Velcro did. Because people are lazy :-p

    Almost all the chromium molybdenum steel used in bicycle frames is, however, 4130 or an equivalent international standard because of its prevalence in tubular aircraft structures. Lots of 4130 gets drawn to a variety of tubing sizes in plain guage - it wasn't too much work to have it redrawn or reshaped into bicycle frames.
    "While my father fought for you, I learnt. While my father glorified your petty administration, I learnt. While he longed every day for our line, Adunís line, to be restored, I learnt. He sent me away to bring the Dark Templar back when the time was right!
    "And you tell me that I cannot do this? That I cannot feel the weight of the universe?
    "Damn you, Tellan! Aldaris killed my father!"

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