Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
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Actually, the shop is right about using that gear comvo. It's called cross chaining, and tends to accelerate wear on the components because the chain is running at such a severe angle sideways. Step behind the bike, when it's in that combination and you'll see what I mean.
That sais, the new crank may not have fit on the spindle EXACTLY the same amount as the old crank.
You could probably turn the FDER L screw out 1.4 turn or so. Too much, and you may be throwing the chain off the small ring in other combos.
Another possibility is that the cable doesn't quite have enough slack, but I would play with the L screw first. Just don't get crazy with it and KEEP TRACK where it's initially set. You may have to return it to that spot.
And really, you DON'T want to use the extreme chain angles if you can avoid it. That's why you have all those gears. Think of your bike as really being an 18 speed.