What tire pressure are you running?
04-29-2011, 10:00 PM
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What tire pressure are you running?
I have gone to non run flats...18/19's this week. The tire shop put 45 psi in them says I should run 45 psi in them. I think that is way too much and my sensors do also as they are coding that the pressure is too high. I just deflated them to 35 this evening. The tires don't say on them... only max pressure you can run. I am just curious what pressure some of you guys are running in your non run flats.
Mike
Mike
04-29-2011, 10:01 PM
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Manual for the car says 30 psi cold.
04-29-2011, 10:02 PM
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Mike - the factory recommends 30 psi cold in the tires. I see no reason to vary from that even though you have 18/19 tires on the car. I run 19/19 on mine and use 30 psi in them and they do just fine.
Whatever shop put 45 psi in them knows little about what they are doing.
Whatever shop put 45 psi in them knows little about what they are doing.
04-30-2011, 03:02 AM
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It's worrying that "experts" in a tire shop recommended 45psi
As has been said, the book says 30 psi cold
Like 8vette7 I run slightly lower pressures. I was running 28 psi cold to give about 32 hot. Even at that pressure I had more wear in the center of the tread at the rear over the life of my last set of Michelin AS ZPs.
As has been said, the book says 30 psi cold
Like 8vette7 I run slightly lower pressures. I was running 28 psi cold to give about 32 hot. Even at that pressure I had more wear in the center of the tread at the rear over the life of my last set of Michelin AS ZPs.
04-30-2011, 08:35 AM
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I run 30 psi cold. I was told many years ago to not let the tires go over 35 psi hot. Here in the south during the summer I drop it to 27-28 cold trying to stay under the 35 mark. This has helped with my tire mileage & handling 
04-30-2011, 10:09 AM
#18
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The lower the cold tire pressure the more tire sidewall will flex,the more flex the more heat generated the higher the hot pressure. Most tires have a sidewall construction of their own design so rule of thumb,let the hot pressure rise 10% of cold pressure i.e. 30 cold= 33 hot. This from my good friends at Goodyear/Dunlop.
04-30-2011, 10:14 AM
#19
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Local Vette shop says the most even tire wear happens at 32psi (cold). Have to say my tread is completely even all the way across.
04-30-2011, 10:15 AM
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I believe if you look again, that impression on the tire says Max. 45 psi.
That means the cold pressure plus the heat up from operation and direct sun and ambient from the road.
If you have 45 in them, as soon as you start to roll the friction heats the tire and the pressure increases, immediately you have exceeded the tires' design specification. Expect a blow out, or sidewall damage. Excessive wear and excessive hard ride will accompany that pressure too.