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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, 04:34 PM   #1
killsurfcity
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how do i know if my chainline is straight?

i swapped my 44 tooth chainring for a 52 and put on a new sram chain recently. when i put the chainring on, it was on the opposite side of the spider legs as the 44 (it didn't fit on the other side). so how do i know how that effects my chainline? i'm not sure how to tell if it's straight. it makes a little noise, but it's not bad. i just want to be sure it's straight so problems don't arise later because of it.

the other thing i noticed when doing this is that the space between my drop-outs is a good bit wider than the space between the nuts on the axle on either side of the hub. so that when you tighten the outer nuts on the fix the wheel in place it squeezes the dropouts in about .75" before clamping down on them. is this okay? what should i do if i want to fit it better?
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Old 09-09-05, 05:04 PM   #2
curlybro
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You know that your chainline is straight if it is indeed straight.
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Old 09-09-05, 06:45 PM   #3
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eyeball it.
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Old 09-09-05, 06:52 PM   #4
iamjberube
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http://www.sheldonbrown.com/chainline/
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Old 09-09-05, 07:07 PM   #5
Msngr
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the best way to check if your chainline is straight is to take it to a club and get it a little drunk. introduce it to other chains of various sexes. see what happens.
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Old 09-09-05, 07:26 PM   #6
EnLaCalle
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.......... testing. testing. 1-2.

1-2.

Is this thing on?

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Old 09-09-05, 07:38 PM   #7
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Kil... wrote:

"it didn't fit on the other side"

How interesting.

In what way did it not fit?
Did the bolts bottom out without tightening the chainring down?

In any event, some makes of cogs have a flange on one side that allows the user to space the cog against the hub.
For example, an EAI cog has a flange that, when placed against the hub lines the cog up with the chainring in the outer position; and, conversely, when placed with the flange against the locknut, lines the cog up with the chainring in the inner position.
If Kil...'s cog doesn't have a flange, and he has his chainring on the inner position, he has a good start on a straight chainline.

Prop the bike up vertically and kneel down behind the bike and simply sight down the chain.
If the chain bends either way it will look obvious.
If it doesn't look obvious, then I would call that a good-enough chainline.
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Old 09-10-05, 10:47 AM   #8
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If you don't trust your eyes, use a long metal straight edge ruler, or a long level. Line up with the rear cog, and sight along to the chainring.
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Old 09-10-05, 11:02 AM   #9
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Quote:
Originally Posted by Msngr
the best way to check if your chainline is straight is to take it to a club and get it a little drunk. introduce it to other chains of various sexes. see what happens.
The problem is that with enough drinks some chainlines that are supposedly straight will become a little adventurous, though in the morning they will deny that the were ever anything but perfectly straight.
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Old 09-10-05, 12:00 PM   #10
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Straight or not, as a veterinarian, I beg all of you to get your chainlines fixed at an early age.
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Old 09-10-05, 12:46 PM   #11
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Sounds like it didn't fit because it would rub the chainstay, that's my guess.

If your chainline likes the OC then it's probably not straight.
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Old 09-10-05, 12:47 PM   #12
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not that there's anything wrong with that...
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Old 09-10-05, 01:33 PM   #13
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thanks... i think it's good. i rode around last night and it was smooth and silent. i was just curious. i'm new to doing repairs myself so i'm asuming ignorance.
btw... some of these responses we're fekking hysterical. i love it.
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Old 09-10-05, 02:15 PM   #14
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Originally Posted by manboy
not that there's anything wrong with that...
+10 for seinfeld.
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Old 09-10-05, 09:15 PM   #15
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Quote:
Originally Posted by killsurfcity
thanks... i think it's good. i rode around last night and it was smooth and silent. i was just curious. i'm new to doing repairs myself so i'm asuming ignorance.
btw... some of these responses we're fekking hysterical. i love it.
smooth and silent, eh?


i don't know. . .
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Old 09-10-05, 10:05 PM   #16
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****ing NYC chainsvestite

psst > i just got back from Germaanfest or whatevere it s called and they had realy big beers, and I had some. my turn to post all boozed up B.
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