CAAD9 CX tire size limit

[rice rocket]

Anyone push the tire-size limit on this bike (and stock fork)? There's a couple gravel-filled events I want to hit up, I'd like to smooth out the ride as much as possible.

I spotted Ritchey Speedmaxs that come in 700x40c, which looks like a good choice...if it fits.

[Jnnybrns]

I found I could easily get 35s in but 40-42 not so much.

[rice rocket]

Thanks!

Do you remember if it was a diameter issue or width?

If it's diameter, I do have a couple 650b rims sitting around...