i switched from the 17x8 bullit rims to the 17x9 cobra r's and i kept my 245/45/17 goodyears.The factory says to have 30psi in the tires for the factory wheels,but when i had my cobra r's put on,the tire place only put 25psi in them.Is this right?Or should i continue to go with what the factory recommends even though i changed rim size?Thanks Shane