Advertise on Bikeforums.net



User Tag List

Results 1 to 15 of 15
  1. #1
    Just tighten everything
    Join Date
    Jul 2005
    Location
    jamaica plain, ma
    Posts
    133
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    How much does seat tube length matter?

    OK, here's the issue:

    I've decided my current conversion is a tad too large (58 c-t st and 56 c-c tt), and so I want a new training bike. Basically, I'm considering two options. The first is to get a 53 cm IRO mark v (53 c-t st and 54 c-c tt). The second is to really deck out a univega super-ten that I already have and have been using to get groceries with for a while. At the moment it fits alright, but isn't configured for hard riding, so I can't tell how it would be as a new training bike. The super-ten measures 51 c-t st and 54 c-c tt.

    Everything else aside, how much would having a 2 extra cm on the seat tube matter? I'd prefer to just use the old frame and spend the $250 I save on a brooks swallow or something.

  2. #2
    King Among Runaways hyperRevue's Avatar
    Join Date
    Mar 2005
    Location
    MKE
    My Bikes
    2004 Bianchi Pista, Cannondale Track, Soma Pake, Schwinn Breeze
    Posts
    4,215
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Can't you just lower the seat 2 cm to compensate?

  3. #3
    Just tighten everything
    Join Date
    Jul 2005
    Location
    jamaica plain, ma
    Posts
    133
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    that's sort of the basis of my question. But the extent to which the seat post is exposed changes the hieght of the stem, right?

  4. #4
    King Among Runaways hyperRevue's Avatar
    Join Date
    Mar 2005
    Location
    MKE
    My Bikes
    2004 Bianchi Pista, Cannondale Track, Soma Pake, Schwinn Breeze
    Posts
    4,215
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yeah.
    If you lower the seat you wont have the same reach angle so you might want to lower the stem as well.
    But, 2cm is not very much at all.
    Whenever I buy a frame, I worry much more about the top tube length than the seat tube length when it comes to sizing.

  5. #5
    MADE IN HONG KONG
    Join Date
    Aug 2005
    Location
    Washington DC
    My Bikes
    some but not enough
    Posts
    1,763
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    ????
    Are you trying to achieve the same saddle to handle bar height relationship and can't tell if you can raise the seat post and bar stem accordingly? Can't you tell from the "do not go" marks on the parts? Does the univega have a threadless steerer tube?
    If you are not having any fun, it's all your fault

  6. #6
    ... tlupfer's Avatar
    Join Date
    Nov 2004
    Location
    Minneapolis, MN
    Posts
    708
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    if your 58cm c-t seat tube bike is a 'tad' too large then a bike 7cm smaller is going to either 1.) be adorned with a strange looking mountain bike or technomic stem, or 2.) be savagely uncomfortable. i have a friend at 5' who rides a 48cm bike. i ride a 55cm bike at 5'11".

  7. #7
    The Red Lantern Rev.Chuck's Avatar
    Join Date
    Apr 2003
    Location
    Raleigh NC
    Posts
    5,967
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You want to meaure effective toptube. that is measure in a line, level with the ground, from the top of the head tube to the seatpost or tube. This will give you a better idea of the length of the bike, to compare to your old frame. The length of the seat tube is not to big a deal, not as big as the angle anyway. This assumes you can get a long enough seatpost. I like a compact frame, they are lighter, stiffer and easier to toss around. However I like the way a conventional frame looks.
    If you go wiht a way smaller frame you will have a queer, slow steering bike because of the real long stem neede to get enough reach.
    Are you a registered member? Why not? click here to register. Its free, and only takes 27 seconds!
    Help out the forums, abide by our community guidelines.

    I am in the woods and I have gone crazy.

  8. #8
    Just tighten everything
    Join Date
    Jul 2005
    Location
    jamaica plain, ma
    Posts
    133
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My question got answered. It was a pretty minor point. Thanks guys. Now to decide whether to get a threaded stem or a threadless adapter.

  9. #9
    Just tighten everything
    Join Date
    Jul 2005
    Location
    jamaica plain, ma
    Posts
    133
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by tlupfer
    if your 58cm c-t seat tube bike is a 'tad' too large then a bike 7cm smaller is going to either 1.) be adorned with a strange looking mountain bike or technomic stem, or 2.) be savagely uncomfortable. i have a friend at 5' who rides a 48cm bike. i ride a 55cm bike at 5'11".

    Yeah, I'm 5'8" and riding a 58 cm. I come nowhere near making the stand-over height (and in fact my pubic bone doesn't even clear the top tube). By 'tad' too large, I mean there's a half-fist of seatpost showing and I have a 50mm stem on it and I still have almost no bend in my elbows. Just not the right setup, you know?

  10. #10
    ... tlupfer's Avatar
    Join Date
    Nov 2004
    Location
    Minneapolis, MN
    Posts
    708
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by herst
    Yeah, I'm 5'8" and riding a 58 cm. I come nowhere near making the stand-over height (and in fact my pubic bone doesn't even clear the top tube). I saw 'tad' too large because there's a half-fist of seatpost showing and I have a 50mm stem on it. Just not the right setup, you know?
    gotcha. i assumed you were a bit closer to the proper size.

  11. #11
    roll'em high shants's Avatar
    Join Date
    Feb 2005
    Location
    columbus, ohio
    Posts
    2,392
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    threaded stem.

  12. #12
    Just tighten everything
    Join Date
    Jul 2005
    Location
    jamaica plain, ma
    Posts
    133
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yeah, but a warning, if I go threaded, I'm probably going to get one with a removable faceplate, all of which are pretty fugly (someone prove me wrong).

    I'm afraid this bike is going to be all about functionality.

  13. #13
    asleep at the wheel fixedpip's Avatar
    Join Date
    Aug 2004
    Location
    Chicago
    My Bikes
    Custom Richie Ditta Track Bike, Eddie Merckx Corsa, Marioni Custom Pista, Dolan Cyclocross
    Posts
    974
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by herst
    Yeah, but a warning, if I go threaded, I'm probably going to get one with a removable faceplate, all of which are pretty fugly (someone prove me wrong).
    Do a search on the board for Cinelli Frog and Salsa SUL quill stems. Both have removable face plates and are actually decent looking. There are others as well, but I forget their names off the top of my head.

  14. #14
    Senior Member jamey's Avatar
    Join Date
    Oct 2004
    Location
    st. pete/tampa, FL
    Posts
    1,588
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by herst
    Yeah, but a warning, if I go threaded, I'm probably going to get one with a removable faceplate, all of which are pretty fugly (someone prove me wrong).

    I'm afraid this bike is going to be all about functionality.
    removable faceplates might not look the best but they make so much sense. i ride brakeless and i want to switch around my bars pretty often and it makes it easy as hell. AND you don't have to worry about scratching your bars as you wiggle it through the small opening like other stems.

  15. #15
    Just tighten everything
    Join Date
    Jul 2005
    Location
    jamaica plain, ma
    Posts
    133
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yeah, Its probably going to be this one:

    http://aebike.com/site/page.cfm?PageID=30&SKU=SM6373

    Which I think looks similar to the Salsa stem (its just a branding thing, right? Aren't Salsa and Profile both owned by QBP?).

    I haven't been able to find the Cinelli Frog anywhere online.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •