Pappy, your new tires have a higher load index (though not necessarily ply rating) and are capable of holding more air pressure and this more weight. Load index is the 2 digit number next to the speed rating ( ex: 94H). The correct way to determine inflation for these new tires would be to go to the load index chart in the "Tire Guide" (every tire store will have one), look up the old load index (ex 92) and cross reference the car maker's suggested inflation with the weight in the book- then cross reference this weight with the proper inflation for the new load index (should be higher). Simpler, just add 9 lbs- it will probably put you in the ball park. That being said- on modern radials, you will almost NEVER see one fail due to OVER inflation- infact, you will be hard pressed to find one in a million scrap tires that even exhibit signs of over inflation. Modern tires fail or wear prematurely for these reasons- road hazards/ impacts (made more susceptable by low inflation), alignment wear (also exagerated by low inflation), and low inflation. AIR 'EM UP!
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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