Road bike = 44t chainring
Road = 107-33GI
(mate with 11-36 cassette; 11-13-15-17-19-21-23-25-28-32-36).
This is what I'm running on the Talbot CX bike in summer road set-up. Thorn 44t ring, X0 derailleur, one Rival and one S500 leaver. Roubaix didn't kill it, so nothing will.
You're trolling me I know but this is balls, unless you only ever ride at the boring speeds on boring terrain.