Quote:
Originally Posted by bikinchris
Sorry, that's a non answer as far as I'm concerned. The terms used are like the OP. Vague.
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Let me try again:
Back out the low limit screw so that it is a non factor.
Shift into the biggest cog.
Tighten the low limit screw so that it touches the stop on the derailleur - there should be no visible flex or movement from the derailleur if you push on the shifter at this point.
Now back it out 1/4 to 1/2 turn - enough that there is some flex in the derailleur when you push the shifter, but not so much that it even hints at derailing into the spokes.
The derailer should never touch the spokes. If it does, it's likely the hanger is bent to the inside (assuming you've done your limit screws correctly).
There are no hard and fast numbers in bike repair. In this case it depends on the shifter, derailer, bracing angle of the spokes, hanger alignment, cable and housing selection, front or rear, etc. You have to watch the screws go in and out, and tune the system specifically to its own capabilities so that it looks and works right.