Similar in that I just got a super 9 myself, but I decided to forgo rvc (usually use Victorias) and instead purchased Michelin latex 20mms from probikekit

The Vittoria 51mm works in my Zipp Super 9 CC. It would be nice to have more room, but the Silca crack pipe and Leyzene disc adapter head both fit.

yeah, I would think a 40 or 42 would be about perfect on the super 9. mine with 36 needs and extender as not enough valve comes through to get a good seal for inflating.

i use the vittorias which are 42mm i think for my 2014 super 9, and have ample clearance for a crack pipe. No extender needed
http://www.wiggle.co.uk/...ia-latex-inner-tube/

Vittorias are removable core?

Yep I run a front 90 and 60 with valve extenders with them

That link is for a 51mm. I've been buying these Vittorias for a couple of years and have never found the 42mm available. I recently ordered some more of them from the UK and only the 51's were available. Vittoria's site shows that only the 51mm comes with RVC for 2014 so maybe their production has changed.

correct you are. I still use these in the super 9 without issue all the same, no extender needed and heaps of clearance for a crack pipe