I had some on the WTB Protera (Stock Chamois Hagar set up) and they measured 50 on the spot at 30-40 psi. They are ok tires but i prefered something more motocross.

 

Did you have the i-23 rims?
(23 mm internal diameter)
Thanks for the data point!

I'm looking for a 48mm wide front tire.
(My rims have an internal diameter of 22mm)

 

I have the EXO and they measured 52mm with i-33 Nextie rims after one ride, somewhere around 30 psi.

 

Silksheid version - mounted on 25mm inner Light Bicycle rims. Measured 53mm after 2 rides.

 

Silk shield version is 50mm wide on 22mm internal diameter rims.
(Velo Orange Voyager rims)