Originally Posted by
The_Joe
Excellent. Thank you for all the help. If I tell you that she often rides small cog/small chain wheel does it change things?
Probably not unless you're using a 9s RD with a 5/6s chain. Generally you'll only get some rubbing where the chain enters the RD cage at the lower loop. It's easily fixed by filing a bit of entry angle on the front lip at the bottom of the cage.