Singlespeed & Fixed Gear - Cog Widths?

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BostonFixed
01-25-05, 05:28 PM
I am making my winter SS bike into a fixed bike, and I will need to do this via the 'bumbike' loctite method of attaching the cog to the hub. I know the limitations of this setup, and that i'm putting my self at risk, etc.
I want as much room as possible for a BB lockring, so I need a thin-ish cog.
Anyone know the widths of the threaded part of:
Surly Cogs? Old/New?
Durace?
EAI?
Any Others?

Thanks

gotambushed
01-25-05, 05:34 PM
not positive, but i think the old surly's where the thinnest,
i don't have the exact dim's cause i don't have one anymore,
but i remember it being thinner than my EAI and DA
dobber
01-25-05, 05:36 PM
As always, Sheldon Brown is your friend (http://www.sheldonbrown.com/chainline/)

Scroll down about halfway thru the page.

gotambushed
01-25-05, 05:40 PM
no wonder they call him captain bike
46x17
01-25-05, 05:46 PM
...and the different widths are another reason that the highly praised 42mm track chainline is ballpark at best.
dobber
01-25-05, 06:40 PM
...and the different widths are another reason that the highly praised 42mm track chainline is ballpark at best.

Or 52mm in the case of a MTB based fixie, which I apparently missed by about 0.3mm from target if my calipers and measuring methodology are to be believed.

Has anybody ever asked / has the question ever really been answered......how close is close enough for chainline?
thechamp
01-25-05, 07:35 PM
Has anybody ever asked / has the question ever really been answered......how close is close enough for chainline?

If you race, the answer is easy enough. Is perfect chainline possible? (yes) Whether you need it or not depends upon whether you need to blame some lack or performance on your bike instead of yourself.

for most people, who cares... I mean, if it bothers you, make it perfect so you can move on. If it doesn't bother you it is, literally, 'good enough.'

the answer isn't in the bike.
dobber
01-26-05, 03:07 AM
If you race, the answer is easy enough. Is perfect chainline possible? (yes) Whether you need it or not depends upon whether you need to blame some lack or performance on your bike instead of yourself.

for most people, who cares... I mean, if it bothers you, make it perfect so you can move on. If it doesn't bother you it is, literally, 'good enough.'

the answer isn't in the bike.


Have you though about political office?