Originally Posted by
Bill Kapaun
That means you have a triple.
Put it on the middle ring and a middle cog.
Easy if you have an odd number. If not try both middle cogs & compare the difference.
NOW- Stand a way back, behind the bicycle and eyeball it,
It's pretty easy to see if the chain line is parallel to the center line of the bike.
There is 8 cogs, by eye 3rd of the small cogs lines up with the middle chainring. The middle of the cassette lines up with the small chainring instead.