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Its because they assume you run wide tires and label max pressure accordingly.
Mavic do the same with their mtb/touring rims, so out of the box you think 60psi is max, but it changes if you put a narrow tire on it.
This chart is for their A319 rim
http://www.mavic.com/sites/default/files/download/tirepressurechart_eng.pdf
Simba
Heldring
I didn't think Crests could take road pressures?