Tire Pressure for a Camry
in [Toyota Camry]
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From: Charlie on 5 Nov 2007 07:15 Read a long thread about tire pressure. The strongest replies were from owners of Ford and GM and Chrysler Jeep trucks? Lots of good ideas, but this is supposed to be a Camry forum? Anyway, I have a 2000 model Camry. I use Yokohama tires. I have information from a source I trust (not internet) that the Yokohama's I buy are priced at the top of the "street" tire range but built to specs that are in the low end of far more expensive "performance" tires. Also, these tires carry a model number designation and are rated slightly better for heat than the 'named' versions. This is apparently because they are built for the heat of southwestern summers. The car manual recommends pressure in the high 20 psi range. The OEM tires had a maximum sidewall rating of 30 or 32 psi. When those wore out I put Yokohama's on with a sidewall maximum rating of 35 psi. The tire dealer insisted on keeping the recommended Toyota pressures. I got about 80% of the rated mileage and a very nice discount on the current set of tires. The latest tires have a different- upgraded- number and a maximum sidewall rating of 45 psi. They also got that pressure placed in them at my insistence. Now I will keep a check on wear with a tread depth gage and find the pressure at which the tires wear evenly across the treads. And, after a lifetime of driving more vehicles and more different kinds of vehicles more miles on the roads of the nation than most of you can imagine or want to know (except racing; but then that is a very specialized kind of thing) I would suggest that the tires on any road car or light truck be inflated at the highest pressure within the tire manufacturers specs which will result in above mentioned flat tread wear. Better pressure for the specific tires in use will generally result in longer tire life and better and safer handling on the road. "M+S" rated tires should also be a requirement for your own sake.
From: ransley on 5 Nov 2007 09:01 On Nov 5, 6:15 am, "Charlie" <char...(a)iamcharlie.com> wrote: > Read a long thread about tire pressure. The strongest replies were from > owners of Ford and GM and Chrysler Jeep trucks? Lots of good ideas, but > this is supposed to be a Camry forum? Anyway, I have a 2000 model Camry. > I use Yokohama tires. I have information from a source I trust (not > internet) that the Yokohama's I buy are priced at the top of the "street" > tire range but built to specs that are in the low end of far more expensive > "performance" tires. Also, these tires carry a model number designation > and are rated slightly better for heat than the 'named' versions. This is > apparently because they are built for the heat of southwestern summers. The > car manual recommends pressure in the high 20 psi range. The OEM tires had > a maximum sidewall rating of 30 or 32 psi. When those wore out I put > Yokohama's on with a sidewall maximum rating of 35 psi. The tire dealer > insisted on keeping the recommended Toyota pressures. I got about 80% of > the rated mileage and a very nice discount on the current set of tires. The > latest tires have a different- upgraded- number and a maximum sidewall > rating of 45 psi. They also got that pressure placed in them at my > insistence. Now I will keep a check on wear with a tread depth gage and > find the pressure at which the tires wear evenly across the treads. And, > after a lifetime of driving more vehicles and more different kinds of > vehicles more miles on the roads of the nation than most of you can imagine > or want to know (except racing; but then that is a very specialized kind of > thing) I would suggest that the tires on any road car or light truck be > inflated at the highest pressure within the tire manufacturers specs which > will result in above mentioned flat tread wear. Better pressure for the > specific tires in use will generally result in longer tire life and better > and safer handling on the road. "M+S" rated tires should also be a > requirement for your own sake. They will be less safe as you have much less tread on the road, at the max rating you severly risk blowing out belts as there is little give to the tire. It will increase in pressure as it gets hot. Going back to 30-37 would be smartest. I blew out a new michelin going to 40 and it had a rating of 45, I broke a belt. Pressure is based on saftey and comfort, a balance.
From: Roy on 5 Nov 2007 10:17 "Charlie" <charlie(a)iamcharlie.com> wrote in message news:472f099a$0$11440$4c368faf(a)roadrunner.com... >"M+S" rated tires should also be a requirement for your own sake. Why do you say that? Have they changed the standards for a M&S tire for more than 3"of snow???
From: Pszemol on 5 Nov 2007 10:37 "Charlie" <charlie(a)iamcharlie.com> wrote in message news:472f099a$0$11440$4c368faf(a)roadrunner.com... > the rated mileage and a very nice discount on the current set of tires. The > latest tires have a different- upgraded- number and a maximum sidewall > rating of 45 psi. They also got that pressure placed in them at my > insistence. Maximum rated pressure is what it says: MAXIMUM. Not the expected normal operation pressure. Similar situation is in electronic - they also have maximum allowed rating, but they have listed normal operation range... A chip designed to work at 5V will have maximum rating of 7V but it does not mean you power it with 7V - the difference between maximum rating and normal operation is the buffer zone for avoid failures. Think of the other aspect - how acurate you think your pressure gauge is? 10%? Maybe... but maybe 15%? When was it calibrated for the last time? 10% of 45 is 4.5 - in worst case your measured pressure 45 is really 49.5psi, which is above manufacturer maximum!!!! And when you measured it on cold tires it might be much higher when driving high speed! In your obsesion of saving tire thread life your are forgetting about your own safety - blown front tire at highway speed can be DEADLY.
From: ransley on 5 Nov 2007 13:53
On Nov 5, 9:37 am, "Pszemol" <Psze...(a)PolBox.com> wrote: > "Charlie" <char...(a)iamcharlie.com> wrote in messagenews:472f099a$0$11440$4c368faf(a)roadrunner.com... > > the rated mileage and a very nice discount on the current set of tires. The > > latest tires have a different- upgraded- number and a maximum sidewall > > rating of 45 psi. They also got that pressure placed in them at my > > insistence. > > Maximum rated pressure is what it says: MAXIMUM. > Not the expected normal operation pressure. > > Similar situation is in electronic - they also have maximum allowed > rating, but they have listed normal operation range... > A chip designed to work at 5V will have maximum rating of 7V > but it does not mean you power it with 7V - the difference between > maximum rating and normal operation is the buffer zone for avoid > failures. > > Think of the other aspect - how acurate you think your pressure gauge is? > 10%? Maybe... but maybe 15%? When was it calibrated for the last time? > 10% of 45 is 4.5 - in worst case your measured pressure 45 is really > 49.5psi, which is above manufacturer maximum!!!! And when you > measured it on cold tires it might be much higher when driving high speed! > > In your obsesion of saving tire thread life your are forgetting about > your own safety - blown front tire at highway speed can be DEADLY. Is your pressure gauge tested to a calibrated unit, mine is and many repair shops etc are not, I throw away gauges that are wrong. You might be filling to 48 cold and hot tires could be 52lb. Best is lower them to a few lb over the cars rating. As I said I ruined Michelin.tires overinflating them |