Originally Posted by
smd4
Then I don't know why you'd bring up the B adjustment in a thread specifically about sizing chains, in response to a post specifically about sizing chains for a specific drive train.
As I had already explained above, solely in response to your prior comment about having both RD pulleys "perfectly vertical."
Originally Posted by
smd4
My delay in responding to this post is because I wanted to be absolutely sure about this before I called out BS, so I had to wait until I got home before working on my bike. Now that I've done so, and run the B adjustment screw--all 11 mm of it--all the way in and all the way out, with my chain on the big ring and smallest cog, I can safely say, and without reservation, BS! Moving the screw those miniscule 11 mm one way or the other does not move the derailleur cage at all off the vertical.
That is because you have the appropriate chain length (and therefore chain tension) AND a cassette within the specifications of the RD. I don't, because I am using a GS model to shift a 12-25 cassette.
But please feel free to insist that the B screw does not affect the angle of the derailleur cage under any circumstances whatsoever.