Tire PSI
#22
11-08-2014, 01:14 AM
Since you almost +2 (215/40R17 would be a +2 size increase) your tires I would go with 32psi. At most 34 for best all around OE performance.,
#24
11-08-2014, 11:50 AM
Modern radial tires are not as susceptible to center-tread wearout as traditional tires. The belt keep the tread flat.
Proper inflation helps tire longevity by reducing failures due to excessive flexing. (Ever broken a paper clip by bending it repeatedly?) With today's short sidewalls and big rims, proper inflation also minimize the chance of rim damage.
The best practice to maximize tire life is regular rotation. I do ours every 6 - 10K miles. That gives you a chance to look at the suspension and brakes when the tires are off, too.
Proper inflation helps tire longevity by reducing failures due to excessive flexing. (Ever broken a paper clip by bending it repeatedly?) With today's short sidewalls and big rims, proper inflation also minimize the chance of rim damage.
The best practice to maximize tire life is regular rotation. I do ours every 6 - 10K miles. That gives you a chance to look at the suspension and brakes when the tires are off, too.
#25
11-08-2014, 11:54 AM
***revised please read***
So I went back to the drawing board and instead of assuming what psi would be good have more of a technically sound answer.
You should be running 35psi. The reason be is that this will meet the load index the OE tires meet at 32psi. Also are the tires XL load index? Either way you achieve the load index needed at 35 for both SL or XL rated. If the tire is a SL index then you are gaining nothing for daily driving (since the tire is a max load capacity, a XL index increases load with PSI up to 42psi where it hits max capacity) by increasing the psi. If the car is not cambered and racing you're just wearing edges.
So I went back to the drawing board and instead of assuming what psi would be good have more of a technically sound answer.
You should be running 35psi. The reason be is that this will meet the load index the OE tires meet at 32psi. Also are the tires XL load index? Either way you achieve the load index needed at 35 for both SL or XL rated. If the tire is a SL index then you are gaining nothing for daily driving (since the tire is a max load capacity, a XL index increases load with PSI up to 42psi where it hits max capacity) by increasing the psi. If the car is not cambered and racing you're just wearing edges.
Last edited by Rollerboots666; 11-08-2014 at 12:30 PM.
#26
11-08-2014, 03:47 PM
Since air expands when heated, the air pressure inside a tyre increases when it is warm. Usually a tyre is considered cold when the car has been sitting for at least three hours without being driven. Then again, ambient temperature can also have an impact on this I guess.
From what I have read, tyre pressure increases by between 4/6 psi when warm. Also, the factory indication for tyre pressure indicated on the driver's side door jamb is for cold tyre pressure.
I personally chose to inflate my tyres at 3 psi more than what the door jamb sticker says (35 psi). My tactic is to drive to a gas station and inflate my tyres at 40 psi warm (5 psi more). The next morning before driving, after my car car has been sitting all night, I recheck the pressure and deflate the tyres as necessary to get exactly 35 psi. I've never had the adverse problem of needing to inflate to get 35 so it's all good. I check my tyre pressure every now and then but I find it rarely fluctuates for me.
From what I have read, tyre pressure increases by between 4/6 psi when warm. Also, the factory indication for tyre pressure indicated on the driver's side door jamb is for cold tyre pressure.
I personally chose to inflate my tyres at 3 psi more than what the door jamb sticker says (35 psi). My tactic is to drive to a gas station and inflate my tyres at 40 psi warm (5 psi more). The next morning before driving, after my car car has been sitting all night, I recheck the pressure and deflate the tyres as necessary to get exactly 35 psi. I've never had the adverse problem of needing to inflate to get 35 so it's all good. I check my tyre pressure every now and then but I find it rarely fluctuates for me.
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