Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
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Most likely, the FD will work better if you move it down.
Your current steps between rings (B>S) is- 10-12
The replacement will be 9-13, or less "linear".
This will probably result in shifting being less "precise".
Also, the "radius" of the FDER will mismatch the radius of the rings a bit more.
It should work, but be less smooth.
Don't be afraid to experiment with other than the so called "ideal" clearance above the big ring. I've had one FDER actually work noticeably better when the height was higher than "ideal".
Once you decide that you are going to keep that set up, I'd trim the chain to match.