Fiberglass tanks : experiences?

Discussion in 'Old's Cool' started by GiorgioXT, May 20, 2004.

  1. GiorgioXT

    GiorgioXT Long timer

    Joined:
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    Experiences & adices about fiberglass tanks?
    I had only one - a french-made 20 litres that still sit on my XT500 from 1984 ..but I got a lot of critics from mechanics that stands for aluminium ones ... but alu tend to crack...
    #1
  2. Davo

    Davo BMW Uber alles

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    Melbourne, Australia
    Metal bends Fiberglass shatters. Metal=good
    Metal rusts, fiberglass doesnt. Fiberglass=good

    Other considerations. wieght, painting.
    I prefer my aluminium tank but only because it came with the bike and the Touratech 41l is so expensive. If it were free i would be just as happy with a fiberglass tank. :thumb
    #2
  3. Frank Warner

    Frank Warner Traveller

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    Err as far as I know Touratech tanks are plastic not fiberglasss.

    Fiberglass tanks were popular on the spanish bikes of the '70s. They had a thick 6mm? skin on the outer surfaces that could hit things in a fall. So they were unlikly to shatter.

    Every material has it weak points, chose your failure method?
    #3
  4. Davo

    Davo BMW Uber alles

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    Sorry i was being a little generic in my answer. I'll shut up now :hack
    #4
  5. Frank Warner

    Frank Warner Traveller

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    Failure modes for plastic tanks
    UV hardening
    Gouging by rocks
    Stress fractures .. usuall around the mold points.

    Failure modes for aluminium tanks
    stress fractures .. vibration points.. (more subsectable to this than steel..)
    Gouging by sharp rocks .. or excessive bending by the same rocks

    Failure modes for steel tanks
    stress fractures .. vibration points..
    Excessive bending by the sharp rocks
    Rust!

    Failure modes for fiberglass tanks
    stress fractures .. vibration points..
    Gouging by sharp rocks .. or excessive bending by the same rocks
    UV hardening

    They all can fail along the seem lines.. manufacturing defects ..
    I think those are the main ones. Any others?

    ----
    Basicly any tank can be good .. it depends on the quality of the product.
    #5