Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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As the others have pointed out it's about chainring alignment with the rear sprocket, not chainstay clearance (unless there isn't any). An easy way to confirm good chainline is to lay a straightedge (or anything both straight and long enough, like a length of dowel rod) along the outside of the chainring on a secant and carrying it back to the rear sprocket. Ideally it should line up the same way, but anything within a few millimeters is fine.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance