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  1. #1
    Join Date
    Nov 2012
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    Trek aluminum bike seat tube corrosion concern

    I just bought an 80s aluminum framed Trek used for my son. Got it home and noticed corrosion on the seat tube near the front derailleur. Attached some images.
    So, is it dangerous to ride the bike with this corrosion present, i.e. could the seat tube crack now or sometime in the future?
    -Garytreak bike 2.jpgtrek bike 1.jpgtrek downtube 1.jpgtrek downtube 2.jpg
    Last edited by garynchait; 11-23-12 at 09:16 PM. Reason: error

  2. #2
    Senior Member
    Join Date
    Apr 2009
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    185 Post(s)
    1 Thread(s)
    Yes, it is corroded, probably from being stored outdoors, or in a very damp basement. And, Yes it might crack one day, but that could be years away.

    In any case, it isn't dangerous because a seat tube failure there isn't likely to cause a crash. It's most likely to crack when climbing a steep hill with lots of pedal pressure, in other words at very low speed. I'd have no problem riding this as an around town bike, or on longer rides if I had access to alternate transport in the event it cracked.

    Having cracked a frame in a similar place 100 miles from home and having to do a field repair (which lasted 2 more years) I can assure you that the worst that will come of riding this is inconvenience.
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    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

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