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Old 04-30-15 | 01:19 PM
  #6  
FBinNY
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Joined: Apr 2009
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From: 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

OK, this isn't all that rare. The chain is coming from the outside so it pulls back toward the larger ring. Ideally it couldn't fit and fam into the gap between the teeth and outer ring face, but life isn't always so ideal.

You might (only maybe) improve things with a bit of inboard trim adjustment for a snappier shift, but the side effects like possible chain drop may not be worth it. The right fix, would be to thin the inner ring to move the teeth over closer to the outer ring, but that also is lot's of work unless you own a belt sander or similar tool.

One other fix that will definitely improve things is to go with a slightly wider chain. Even within the same "speed" class, ie 9s,10s,11s, there's variation in actual chain width. A few extra 10ths of millimeters width might be the critical difference and solve or at least greatly mitigate the issue.
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