I had the tan Compass (not RH labeled) Chinook Pass (standards) tires on Alexrims A23 rims and they have the file pattern tread and started at 27.5mm. A year later, when I removed them and put them on a new set of wheels with Velocity Dyad rims (1mm wider) they were at 28mm. I inflate the tires to 95+ on my Silca Pista floor pump until they have minimal deflection or softness by thumb pressure.

The Dyad wheels now have Stampede Pass (tans) 32mm (standards) at the rated 32mm after a season of riding. I have found them to be accurate in width and I am a heavy rider with them inflated higher. Interestingly, I found the Stampede Pass 32mm tires has a longer roll down coasting distance than the lighter, narrower 28mm tires.

This size change is quite a difference from my prior Continental GP4000SII in 28mm that actually measured 30mm, on the Alexrim A23 wheels. They started at about 28.5 and grew to 30.5.

I found that the Clement Seta tubulars with the ribbed tread (circa mid-1970s) to be the best tires I ever had UNTIL I tried the Compass Chinook Pass and 28mm Conti GP4000SII.tires. Both ride closer to tubulars than I thought would be possible.