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  1. #1
    Senior Member passerby's Avatar
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    Schwinn madison seatpost diameter...wtf?

    well i had checked every possible website giving the specs of the 08 madison and all of them said that the seatpost diameter was 27.2. so i bought a 27.2 kalloy seatpost and it was too small!!! does any1 know if the specs are incorrect or did i just recieve a seatpost that was smaller than 27.2? could the seatpost be 28.6 or 29.2?
    Don't upgrade, ride up grades.
    08 Schwinn Madison
    09 Fuji Roubaix

  2. #2
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    The seatpost is 27.2 i have a madison

  3. #3
    Loving Fixed Riding! DIRT BOY's Avatar
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    What? That the first I have heard. They seem to vary between 27.0 and 27.2. Mine came with a 27.0 and it was cheap. So I bought a 27.0 DA but it slipped a bit. So I sanded the inside a bit and got a 27.2 Velo-Orange post in there.

    Now, are you SURE the post you bought is 27.2? Even Schwin tecks told me their frames vary form 27.0-27.2
    DIRT BOY

  4. #4
    Senior Member passerby's Avatar
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    okay then i probably did get a smaller seatpost on accident...man, this sucks. thanks for everything guys
    Don't upgrade, ride up grades.
    08 Schwinn Madison
    09 Fuji Roubaix

  5. #5
    Gears? CliftonGK1's Avatar
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    Digital calipers.
    Seriously, everyone should have a pair in their toolbox. They're cheap as hell now; you can get a pair for under $30 at Home Depot, or under $20 at Harbour Freight Tools.

  6. #6
    K2ProFlex baby! ilikebikes's Avatar
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    My response would have been something along the lines of: "Does your bike have computer controlled suspension? Then shut your piehole, this baby is from the future!"
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    I have an "Old School Blue" Maddy and I don't know how or why but I can use either a 27.0 or a 27.2 with no problems at all.
    You see, their morals, their code...it's a bad joke, dropped at the first sign of trouble. They're only as good as the world allows them to be. I'll show you. When the chips are down, these...These "civilized" people...they'll eat each other. See, I'm not a monster. I'm just ahead of the curve

  7. #7
    Senior Member beeftech's Avatar
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    Quote Originally Posted by CliftonGK1 View Post
    Digital calipers.
    Seriously, everyone should have a pair in their toolbox. They're cheap as hell now; you can get a pair for under $30 at Home Depot, or under $20 at Harbour Freight Tools.
    Or stop being lazy and learn to read standard calipers.
    Measuring a seatpost diameter (or much of anything on a bike) does not require a digital caliper. And if you really needed to get exact measurements, you would get a dial caliper.

  8. #8
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    Quote Originally Posted by beeftech View Post
    Or stop being lazy and learn to read standard calipers.
    lighten up, gramps. precision measurement is precision measurement. digital gets the job done as well as analog.

    PS...is that a digital watch you're wearing?

  9. #9
    Gears? CliftonGK1's Avatar
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    Quote Originally Posted by beeftech View Post
    Or stop being lazy and learn to read standard calipers.
    Measuring a seatpost diameter (or much of anything on a bike) does not require a digital caliper. And if you really needed to get exact measurements, you would get a dial caliper.
    If I really need exact measurements I'll bring home my calibrated NIST traceable digital calipers from work so I can measure seatpost diameter and how many nanometers of grease are still on it.

    At home, I'll take the lazy route and use my $25 cheapo pair from the hardware store.

  10. #10
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    I took my seatpost out today and it says 27,0 on it. i double checked it by measuring with a nice metal ruler and it is indeed 27.0.

    and indeed, its about 380mm long and quite heavy.

  11. #11
    chickenosaurus j3ffr3y's Avatar
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    Quote Originally Posted by CliftonGK1 View Post
    Digital calipers.
    Seriously, everyone should have a pair in their toolbox. They're cheap as hell now; you can get a pair for under $30 at Home Depot, or under $20 at Harbour Freight Tools.
    +1, I insist that everyone order this now
    http://www.dealextreme.com/details.dx/sku.2306
    2010 Motobecane Team Track
    1997 GT Edge
    2012 Kilo TT Stripper

  12. #12
    Senior Member tradtimbo's Avatar
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    when you measure the inner diameter of the seat tube with ANY calipers, your reading will have an error. The error is usually larger than how precise the caliper is. The reason for this is that the measurement you need is when the bolt, or skewer, is tight against the seat post. When the bolt or clamp is open, your measurement will be too large. The seat tube flares at the top a bit when it is open. Also, when the collar, or clamp is open, the opening is not perfectly round. You could very well get different measurements depending on which way you measure.

    with this said, choose whatever caliper you want, how precise a reading is depends on the flared status of the top of the seat tube.

    The best way to get this measurement is to either try a bunch of different common seat post sizes, or use a seatpost sizing tool. A bike shop will usually have both.
    Can anyone give me a ride from Monterey to Big Bear on Wednesday or Thursday?

    The Sustainable Cyclist

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