diff. tire size should mean put diff. psi right?

[ezhacker1]

from stock 185/60/15 to my current 205/50/15, my current tires are smaller. I currently have them inflated to 32psi, do different tire sizes mean i should change the psi?

[YotaYaris]

It says on the side wall of the tire. Thats what I would go with.

[Brentorius]

I would say no; 35 psi and call it a day.

[jambo101]

Your owners manual or the sticker on the drivers side door jamb should give you the correct tire pressure..

[YarisSedan]

The sticker on your door jam will give you a tire pressure number that will give you the best overall ride quality/economy/and wear. You can adjust up the tire pressure if you like but i wouldnt suggest going down lower than the recomended tire pressure. Whatever you do dont exceed the number that says maximum tire pressure on the sidewall of the tire.

Id say 35 is a good cross between handling and without making the ride too harsh. 40 is good if you want more fuel economy and less sidewall flex for hard turns but things will start to get little harsh on potholes from there.

Im sure theres lots of people that will chime in. Many many posts related to tire pressure.

[ezhacker1]

i was under the assumption that the door jab psi recommendation was for stock size tires. Though that different size tires would need different tire pressure.

[Altitude]

Originally Posted by ezhacker1

i was under the assumption that the door jab psi recommendation was for stock size tires. Though that different size tires would need different tire pressure.

I too don't think the doorjamb sticker is relevant unless you are running stock tires or tires that are of the same size as stock.

[ezhacker1]

anyone else know? size different, different pressure than doorjab?

[Loren]

Depends on your goals. Also depends on the specific tire.

Whatever the door sticker says should be safe and adequate for any size tire you could reasonably fit on a Yaris. If all you want to do is be safe and adequate, run with that.

If you want better steering response and/or less rolling resistance (better fuel economy) at the expense of ride quality, try experimenting with higher tire pressures up to whatever is stated on the sidewall of the tire.

You can't go wrong with 32-35 psi as a general rule for the typical commuter. Something in the 40 psi range will help most tires deliver sharper steering response. And hardcore hypermilers will swear by running 50-60 psi to get the best economy.

If you're an aggressive driver, look at your tires, they will tell you what pressure to run. Look at the edges of your tires. Is the tread rolling over onto the sidewall area when you take corners? If so, you don't have enough pressure. You can even use the old autocrosser's trick of marking the edge of the tread/sidewall with chalk or white shoe polish to show exactly how far the tread is rolling over.

[127.0.0.1]

Originally Posted by ezhacker1

anyone else know? size different, different pressure than doorjab?

doorjamb is the best to go with regardless of size, and you get closest to the vehicle design and handling parameters that way.


35 psi setting is a catch-all... general -60% of the time, it works every time-

going up to sidewall pressure will give a rough ride, and make braking harder on bumps

[Black Yaris]

Originally Posted by YotaYaris

It says on the side wall of the tire. Thats what I would go with.

wrong, that is the MAX tire pressure

32 is the recommended tire pressure

Loren has explained the reasons for higher tire pressures well enough