King of the Hipsters
Join Date: Jan 2005
Location: Bend, Oregon
Bikes: Realm Cycles Custom
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"it didn't fit on the other side"
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.