Originally Posted by
TooMany
90/95 psi front and rear. The wide rim really bulbs out tires quite nice. 28 mm Conti GP4000s measure 33 mm across with a caliper and the 25 mm version measures 29 mm mounted up. The wearing contact patch looks about the same as similarly sized tire on a single with a more narrow rim.
If you have not already done so, I suggest checking the max pressure rating on your rims. I have been surprised by the added stress wider tires put on rims.