proper tire pressure..

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chocolat1701

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i have 20" after market rims and the size is 225/35/40 and im currently filling it with 40 psi the max is 44psi for this tire. now my question is whats the best presure for this tire i know the oem is 35 but i think 40 protects the rim better when hitting pot holes and stuff.. guys what are your thoughts what do you use on your tires.
 
From personal experience, i believe 35 does a good enough job at protecting the rims. I've always used 35 in all my sets of wheels (6+) in 3 diff cars with rims ranging from 16"-20". And i live in North Jersey and PA. The roads are sh1t.

I have tried 40psi before but its made the ride too harsh for my taste. I dont like feeling every bump on the road. Also made me feel that the tires would be more prone to "pop" if you hit a pot hole hard enough.

And i think factory is 30psi
 
mlara1129 said:
From personal experience, i believe 35 does a good enough job at protecting the rims. I've always used 35 in all my sets of wheels (6+) in 3 diff cars with rims ranging from 16"-20". And i live in North Jersey and PA. The roads are sh1t.

I have tried 40psi before but its made the ride too harsh for my taste. I dont like feeling every bump on the road. Also made me feel that the tires would be more prone to "pop" if you hit a pot hole hard enough.

And i think factory is 30psi
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35 has always treated me well down here but to be honest potholes are a snowbird myth here in Florida. :)

It does seem to be the best compromise for wet/dry and ride/performance. 40 is where I start when I go to a SOLO event.
 
you bring up a good point. Depends on what type of driving. I think its fair to say 35 is good for DD.
 
I have sold and installed tires for years. Not that it is something to brag about but I am certified by Michelin as a Master Tire Specialist. 35-38 should be perfect but remember to check the pressure with the tire cold (at leaast 3 hours of sitting). As little as a ¼ mile of driving can warm the tire enough to alter the reading as much as 3 psi (higher than a cold reading)…. I think any more than 40, or less than 32, will cause uneven wear and poor performance.
 
Hmm so I should lower it to 38 to get a more comfortable ride I just think that 35 is too low. I live in Phili now so the roads are full of pot holes are everywhere i have read that 40 psi gives a harsher ride but better protection for the rim in low profile tires but it puts more pressure on the suspension.
 
I had 45 in the front hankooks and 40 in the rears. dropped them all to about 31psi. will see how it rides and if steering levels out some.

I guess there is better mileage with hard tires, but the type of driving we do around here, I don't think it matters much one way or the other.

With the tires hard we really feel the road, but appears to do some tramlining on the highway.

Didn't think the recommended pressure was so low (30psi) until I actually read the manual.
 
35psi on stock 17's. I didn't notice the change too much. But I feel better knowing I squeezed a little more air in there.
 
Not that I know of. If it wanders I tend to think it's the crown in the road before I think my car needs an alignment.
 
my 19's are at 35 and seem pretty good, have hankook tires. I do notice that my car does a lot of wandering and drifitng on the roads here in MI. Had the alligenment checked twice and all is good, just think the low profile tires really ride every grove in the road and thats why its doing that.
 
You can always remove a PSI or 2 and see if it responds better for you.
 
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