Originally Posted by
stapfam
... Set it up for Big/Big and with the shortest chain possible and when I went 26/28 I had a problem. The top RD cog was rubbing on the cassette. Tried to set the screw to tension the chain away but had to go 28 on the granny to get it acceptable. This was with a Sora RD and there is a limit to how many teeth the RD can handle. It was still too close for comfort though....
Hmmm, I'm having a little trouble understanding this. You're talking about the B screw adjustment, right? You fixed the RD jockey wheel rubbing on the biggest cog of the cassette by changing the
granny ring? I seem to be missing something (likely).