Joined: Mar 2008
Posts: 5,559
Likes: 53
From: The 'Wack, BC, Canada
Bikes: Norco (2), Miyata, Canondale, Soma, Redline
There should be a small but easily felt and seen amount of side play if you slide the links side to side on the cog. If not then your cog is too wide or chain too narrow.