Serotta CSI

Makes sense any particular reason for the Nemesis? Because they've got an established rep?

Are you tempted by something a bit wider if you're trying to go for a bigger tyre? Or does it not make the same difference to tyre profile as with clinchers?

EDIT: Just realised that they're 21mm so probably the Goldie Locks of tub width [guessing].

Before all the pro's went carbon the Nemesis was the P-R rim, my thinking is that they are therefore pretty thoroughly tested on Pave.

As you point out, being 21mm wide the Nemesis can handle very wide tubs. The question becomes what will fit in the frame, possibly a 25 being the limit.