The (original) trunk tag in my Euro 230SL specifies cold pressures of 1.8 atü front, and 2.2 atü rear, which translates to 26 and 32 psi respectively. I do carry 32 psi rear, but have never understood why the front pressure should be so low, so carry 28 - 30 psi front. The tires are 205/70-14, and these pressures seem to work fine.
Chris