Originally Posted by
FBinNY
No reason not to, except that some people don't like fighting against the cage tension spring. But you still don't know if it's short enough until you try small/small.
But you can't go shorter than what's required for big-big, so why does small-small matter ?
I only fight the rear derailleur spring for the 5 seconds it takes to determine the length, and then I know 100% it will be good.