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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 09-09-05, 08:57 PM   #1
steaktaco
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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
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Old 09-09-05, 09:01 PM   #2
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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.
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Old 09-09-05, 09:16 PM   #3
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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...
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Old 09-09-05, 09:24 PM   #4
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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
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Old 09-09-05, 10:07 PM   #5
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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.
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Old 09-09-05, 10:18 PM   #6
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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.
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Old 09-09-05, 10:58 PM   #7
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Lookin good. Don't hit any bumps.
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Old 09-09-05, 11:20 PM   #8
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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.
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Old 09-09-05, 11:29 PM   #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.
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Old 09-09-05, 11:37 PM   #10
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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
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Old 09-09-05, 11:39 PM   #11
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the tighter the better
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Old 09-10-05, 12:50 AM   #12
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Quote:
Originally Posted by benny
the tighter the better
not even going to touch that one
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Old 09-10-05, 01:33 AM   #13
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i will touch it, many many times
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Old 09-10-05, 04:08 AM   #14
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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.
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Old 09-10-05, 05:44 AM   #15
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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?
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Old 09-10-05, 06:40 AM   #16
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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.
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Old 09-10-05, 08:25 AM   #17
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I say just ride it hard for a few weeks. The chain should stretch enough to give better clearance.
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Old 09-10-05, 08:33 AM   #18
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steak
bring that gearing out next saturday -
Sept 17
2pm
Scrubtrack - $5
3 events
points for win.
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Old 09-10-05, 08:39 AM   #19
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What size tire are you running?
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Old 09-10-05, 10:56 AM   #20
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You have to undo the chain?

Why can't you just deflate the tire? Or is that not enough?
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Old 09-10-05, 11:21 AM   #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.
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Old 09-10-05, 06:56 PM   #22
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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...
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Old 09-10-05, 07:34 PM   #23
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No, no - that gear is his 18, the 14 will be slack.
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Old 09-11-05, 01:34 PM   #24
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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..

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Old 09-12-05, 07:16 AM   #25
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Quote:
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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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