Originally Posted by JiveTurkey
I've heard this line a few times on here. I really don't get it. Why would it suddenly start dropping with the absence of the outer ring and front derailleur?
Certain situations, like hitting a bump while pedaling in 38x12 or 38x(biggest), might try to throw the chain off of the 38 ring. Right now your big ring and derailer prevent that from happening.
If you ditch the big ring, and you find your bike throwing the chain off of the outside of the chainring, consider putting a bash guard where the big ring used to be.
You should be able to adjust the derailer to keep it from requiring trim across the cassette, if that's your only problem with your current setup.