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Thread: Giant brand Road bike question

  1. #1
    Mojo Road Warrior TXRAiDR's Avatar
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    Giant brand Road bike question

    Question to you folks that ride or work on the newer Giants. I rode with a guy today that had to adjust his seat post. At our turn around stop, he got to adjusting it, and the whole seat post was in some kind of sleeve! I'm talking you could remove the post and there was this "attatchment" that came out with it. All this was fitted down with the seat collar. What's up with that??
    "As long as I breathe, I attack"-Bernard Hinault
    I've got more skill on two wheels than the majority of people have on two legs.

  2. #2
    boring the Inbred's Avatar
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    are you referring to the little 'aero' thing? i don't ride a Giant, but their TCRs and some of the OCRs have an aero type post. not sure if it's a slip on type thing, or the actual post.

    is this like what you're talking about?



    "...the seat tube modified slightly, allowing an integrated tube/aero seatpost combination to reduce drag.
    "

  3. #3
    try explaining the internet to a bum!
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    carlos's Avatar
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    TXRAiDR, the sleeve is an insert or shim.

    many frame builders have to figure three things on a seatube. the proper outer diameter for the front derailleur clamp they intend to use, the proper inner and outer dimeter for the given application (road, TT, Tri) to make sure the BB area gets a bit of help in the stiffness dept., and the proper inner diameter for the size of the seatube intended.

    all these will factors will mean that a seatube ends up being a milti-diameter tube both inside and out.

    in some cases, you can skip the seatube bit and use an insert. this saves some time cause they don't have to change the diameter a third time along the tubes length. they can use a insert and concentrate on the other two areas.

    the main deal with the insert is that it must be regreased every 6 months to prevent creaking. also, if you wanna change the seatpost size and the seatpost company only makes a few sizes, you have to get a new insert. some call them a shim. same thing.

    is this what it was?

  4. #4
    Mojo Road Warrior TXRAiDR's Avatar
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    Originally posted by carlos
    TXRAiDR, the sleeve is an insert or shim.

    many frame builders have to figure three things on a seatube. the proper outer diameter for the front derailleur clamp they intend to use, the proper inner and outer dimeter for the given application (road, TT, Tri) to make sure the BB area gets a bit of help in the stiffness dept., and the proper inner diameter for the size of the seatube intended.

    all these will factors will mean that a seatube ends up being a milti-diameter tube both inside and out.

    in some cases, you can skip the seatube bit and use an insert. this saves some time cause they don't have to change the diameter a third time along the tubes length. they can use a insert and concentrate on the other two areas.

    the main deal with the insert is that it must be regreased every 6 months to prevent creaking. also, if you wanna change the seatpost size and the seatpost company only makes a few sizes, you have to get a new insert. some call them a shim. same thing.

    is this what it was?

    BINGO! That sounds pretty logical. The "shim" could be take out of the seat tube, and the seat post out of the "shim". I think that's one of the wierdest things I've ever seen.

    With that, you could theoretically get a bigger or smaller diameter seat post couldn't you?
    "As long as I breathe, I attack"-Bernard Hinault
    I've got more skill on two wheels than the majority of people have on two legs.

  5. #5
    try explaining the internet to a bum!
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    carlos's Avatar
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    yeah. but mainly it's a way to reinforce a thin seatube wall.

    with out the shim the diameter would be something weird, like 32.4

    also, without the shim, i'm not sure that the seatube wall would hold. i think the stipulation is that you have to use that shim since there is so much layback on some compact frames.

  6. #6
    Homesick for Texas Weeg's Avatar
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    Ditto...My Road misile has this set up

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