I know it officially clears 50s but really interested if you could squeeze 2.1 or even 2.2's in this frame.
I should get soon a 32mm internal rims wheelset for this bike with 45mm tires.
Depending on the space left, I could try a 2.1" to check.
They say you need at least 6mm between the tire and the frame.
But I have friends who ride with 45mm with their CFR-505 although it is set at max 42.
They accumulate more mud, and some debris scratches the frame a little but not so dramatic.