The Specialized "Sirrus" WILL NOT accomodate a tire wider than a 30/32! A "small" 30/32 at that!!!
I have Bontrager "Jones CX"'s on my Sirrus disc now--they JUST fit...WITHOUT the front clip-on fender (which I had to remove 'cause the tire rubbed too much!
).
The "widest" tire the Sirrus is designed to handle, comfortably, is a "28".
Sorry!!