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  1. #1
    bannned steaktaco's Avatar
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    how much seat tube clearance do we need?

    hey I'd really like to use the same chain for a 14T AND an 18T cog, but the clearance from the seat tube is TIGHT. it's little over a millimeter. whadaya think? will I have a problem?
    thanks yo,
    -c
    steaktaco.com <-- poohoopsies.


  2. #2
    Senior Member
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    that is crazy.... i would be too scared to ride something that tight. god forbid something slip up while in traffic. or something rolls up and gets wedged in there.

  3. #3
    無くなった HereNT's Avatar
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    I've got maybe a mm more than you do - no problems the last couple of weeks. Could you get by with a 17 and a 14? That's still a pretty huge difference...

  4. #4
    cxmagazine dot com pitboss's Avatar
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    hey taco
    what are you running up front, ring wise?

    I would be hesitant to ride the streets with a wheel that far up my a!ss

    why the need for two diff cogs? i know the versatility of it all. just kinda curious...and whiskeyed up
    Deathlap - cyclocross, training, beer,...escape hatch

  5. #5
    Frankly, Mr. Shankly absntr's Avatar
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    Like me, he's running a street cog and a track cog. Mine are 18 and 15 respectively.

    Is that the new chain you picked up today? How about adding a link back in? Or picking up a half-link?

    My clearance is pretty tight but comfortably so, that might be a little too tight. However, you could also wait for the chain to break in and "stretch" a little which will give you more clearance OR run even thinner tires.

  6. #6
    Just tighten everything
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    Hey, what are you running up front and what are the chainstay lengths of the two gearings? How close are you to your total chainstay range?

    Just curious, I actually have no idea how to answer your question.

    But, you know, I'm like realy curious.

  7. #7
    Retrogrouch in Training bostontrevor's Avatar
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    Lookin good. Don't hit any bumps.

  8. #8
    Senior Member taras0000's Avatar
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    Quote Originally Posted by steaktaco
    hey I'd really like to use the same chain for a 14T AND an 18T cog, but the clearance from the seat tube is TIGHT. it's little over a millimeter. whadaya think? will I have a problem?
    thanks yo,
    -c
    You'll be fine. I ran a set up like that for a while. Things aren't likely to get wedged in there. They are more likely to get deflected by the seat tube than if you ran a "looser" set up.
    Taras - :noun. 1. Typically an overweight has-been that can sometimes be seen pootling around a velodrome on an old Look KG 233.

  9. #9
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    that's pretty tight...i'd want the exact opposite for a "street" cog and a "track" cog. a longer effective chainstay on the street would make the bike, overall, a tad more comfy. while a shorter effective chainstay on the track would give you quicker handling.

    the way you've got it set up now looks a bit on the tight side, but if the tire doesn't rub, you're probably going to be okay. i'd run a set of chain tensioners to be on the safe side though.

  10. #10
    Senior Member thatcher's Avatar
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    I like it. if your chain broke n you had to stop you could just jam a credit card in there

  11. #11
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    the tighter the better

  12. #12
    likes avocadoes
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    heh, like that info would fit here...
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    Quote Originally Posted by benny
    the tighter the better
    not even going to touch that one

  13. #13
    attacksquad
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    i will touch it, many many times

  14. #14
    re:member
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    Apply a torch and a hammer to the seat tube . Like in the attachment. This setup is really tight, see how 50T chain ring protrudes behind a deep rim - the effective chain stay length (as pictured, 19T cog right at the middle of the dropout) is 39cm despite tons of clerance.

    v.

  15. #15
    jack of one or two trades Aeroplane's Avatar
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    Half-links are your friend. Are you sure that it won't fit in the drops with another full link attached?
    Quote Originally Posted by Dr Irwin Goldstein
    Men should never ride bicycles. Riding should be banned and outlawed. It is
    the most irrational form of exercise I could ever bring to discussion.

  16. #16
    bannned steaktaco's Avatar
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    thanks all so far there were only 3 nay-sayers and about 5 yay-sayers. I think I'll ride it around for a bit, I feel a bit more confident now.

    for those who asked the chainring in front is 48T and the effective chainstay lengths is 15" for the 18t and 15.5" for the 14t. I have under an eight of an inch slack on the 18t set-up, which means I have to unclasp the chain to change out the cogs. the 14t sits at the edge but if I took out the tugs I'd have some more play.

    I like the 18t for street ridin', but haven't had the chance to use my 14t on track.
    steaktaco.com <-- poohoopsies.


  17. #17
    . monkey's Avatar
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    I say just ride it hard for a few weeks. The chain should stretch enough to give better clearance.

  18. #18
    cxmagazine dot com pitboss's Avatar
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    steak
    bring that gearing out next saturday -
    Sept 17
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    points for win.
    Deathlap - cyclocross, training, beer,...escape hatch

  19. #19
    Senior Member filtersweep's Avatar
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    What size tire are you running?

  20. #20
    The King of Town manboy's Avatar
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    You have to undo the chain?

    Why can't you just deflate the tire? Or is that not enough?

  21. #21
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    Quote Originally Posted by manboy
    You have to undo the chain?

    Why can't you just deflate the tire? Or is that not enough?
    If ya gots one of those fancy quick link dealies, it might be easier to undo that than pumping the tire up again. Or not.

  22. #22
    Senior Member DiegoFrogs's Avatar
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    You'd only be riding in that gear combination on the track, no? What's the likelyhood of getting a beercan, rock or branch stuck in there while on the track? I'd hate to see a sharp rock scratch that beautiful paintjob... You should also keep a REALLY close eye on your chain-"stretch" situation before going to the track. 1/16" would be enough to really muck things up...

  23. #23
    Frankly, Mr. Shankly absntr's Avatar
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    No, no - that gear is his 18, the 14 will be slack.

  24. #24
    Senior Member
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    Quote Originally Posted by DiegoFrogs
    You'd only be riding in that gear combination on the track, no? What's the likelyhood of getting a beercan, rock or branch stuck in there while on the track?
    You must not be familiar with our track..
    Last edited by jasonyates; 09-11-05 at 01:45 PM.

  25. #25
    Senior Member DiegoFrogs's Avatar
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    Quote Originally Posted by jasonyates
    You must not be familiar with our track..

    maybe I have seen pictures... is it the one with uneven pavement and burned out cars?

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