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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You can eliminate the chainring rub when crossed outer rear to inner front by increasing the chainring separation a bit. There are 0.6mm spacers sold for this purpose. Before you run out and order spacers, consider that the cure might be worse than the problem because excess separation can cause a narrow chain to hang up between the rings on down shifts.
If it's minor, and you don't expect to use the problem combinations, you're best off living with it. If it bothers you, try the spacers. Worst case scenario, it won't shift right and you'll remove them and be back where you started except out a few bucks and some time.
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