[Dave]

I should also add that a short chain is not required. I would never use a chain that won't wrap the big/big. Depending on the exact B screw position, a 54 inch chain may work, but it fully extends the cage, risking damage. The longer chain is quieter.

I'm using a 55 inch chain with short 406mm chain stays. I also use a 48/32 chorus crank, so I have a 42T wrap with a RD that is made to handle a 39T wrap. As you would expect, the 13T is the smallest useable sprocket with the 32T little ring.

I'm not sure what good pictures are, unless you think I'm making this up, but I'll add something to my album.