Originally Posted by
Tourist in MSN
From an engineering point of view, if you were to try 150 psig in a 37mm tire and did not split the tire, you could risk damage to the rim. Some rims are rated for max pressure for different tires sizes. My 37mm tires are rated for 87 psig, my 700c tiouring bike rims are rated for 88 psig with 37mm and 103 psig with 28mm tires.
This. The wider the tire, the more it stresses the rim at a given pressure. For example, MAVIC A719's are rated to (I think) 75psi for a 32mm tire. 150psi with a 37mm tire is going to greatly exceed the rating of most any rim.