Tire Pressure - Toyota Yaris Forums

slvryaris · 08-15-2006, 08:06 AM

What tire pressure does everyone have their tires at? I have the 215/40's and the tires are Toyo Proxys. they hold max 50lbs, and the stocks are suppose to be at 32. Does anyone know if since they are low profile they should have more in them?? I didnt know if I was suppose to keep it at OEM specs or put more in them. I have been known to hit big pot holes and put as to what I refer to it as softballs or baseballs in my tires. U know when the sidewall has a big lump in it. I didnt know if this was due to over inflation and then hitting a hole. I usually kept my tires at 40 psi, but dont want to ruin these. Is there a general rule of thumb??

SimmZ · 08-15-2006, 03:07 PM

The tire pressure doesn't have nothing to do with tires kind or brand. It have something to do with the car model/brand. Check in your driver's door, you probably have a sticker with many information on your vehicule including paint color code and recommanded tires pressure. Some vehicule will require a different pressure for front and rear. On my old Nissan Sentra 2003, Nissan recommand 31 PSI in front and 33 PSI in rear...

Most of vehicule will recommand 32 PSI all around. No matter which tires used.

MWill517 · 08-15-2006, 03:24 PM

If you over inflate your tires, it can cause excessive stress on the tire. That can also cause the tire to wear in the center prematurely. The "baseballs" you refer to are likely from the steel belts breaking and causing a bubble in that spot. That too can be a result of over inflation and / or hitting a big pothole. In either case the tire is degraded and more prone to blowout.
I can only recomend inflateing to the recomended pressure that is on the tire.
The manufacturer tested and has rated it that for a reason. There are cases that slightly higher or lower pressure is not bad. Sometimes in the winter with ice on the roads, a lesser pressure may give you a small amount more traction. Answering the pressure question, different tires do require different pressure. For example, my bycycle tire states max 60 psi. Some tires are rated at 90 psi on large trucks. I Hope that was of some use.

riceboy · 08-15-2006, 03:33 PM

Try talking to your installer to find out ideal psi.. never over or under inflate.. doing that can really take away from your cars overall stability..

slvryaris · 08-15-2006, 04:26 PM

I found this on Toyos website. The Yaris call for the stock tires at 220kga at 32psi and my Toyos will hold 545 at 50psi which is the max. SO I thougt that since the stocks were at 32 at 220 that if you compared the two then the Toyos would neeed at least 27-30psi to make the 220.

Any tire that you install on a vehicle must have EQUAL or GREATER load capacity compared to the tire originally installed on the vehicle by the manufacturer. Failure to follow this fundamental rule may result in tire overload, tire fatigue and sudden failure leading to an accident.

The ability of any tire to safely support the vehicle load and driving forces is TOTALLY DEPENDENT ON THE INFLATION PRESSURE.

All replacement tires must be inflated to a level that will provide at least EQUAL load capacity compared to the tires originally installed on the vehicle. Always refer to the vehicle's TIRE INFORMATION PLACARD to determine the original tire size and recommended inflation pressure. Some replacement tires may require higher PSI to achieve load capacity equal to the original tire. Refer to the load and inflation charts included here to determine correct inflation pressure for replacement tires.

Black Yaris · 11-04-2006, 08:54 PM

I know this is an old thread, but I though it to be important to respond... stock tire pressure us 30psi on the 185/60r15's, this is because 30psi can hold X amount of lbs safely..... when you change your tire/wheel size you need to determine how much pressure with hold the weight of the vehicle... I have a guide at work that will give you how much weight each size tire can hold at each air pressure... BTW to get past the "cold" air pressure, as stated above, switch to Nitrogen, it is a larger molicule and does not expand and contract nearly as much as normal air... who ever told you to run 41-43 psi in any tire on a Yaris has a big 'ol doober in one hand and crack pipe in the other....

Black Yaris · 11-05-2006, 12:37 PM

you actually should drop the airpressure from stock when going to larger wheels... I was also wrong about the stock air pressure, it is 32psi... but I run 30psi of nitrogen in both sets of wheels on 225/50vr15 and stock tires and wheels

08-15-2006, 08:06 AM	#1
slvryaris View User's Garage Drives: 2007 Yaris Sedan S Join Date: May 2006 Location: Indiana Posts: 885	Tire Pressure What tire pressure does everyone have their tires at? I have the 215/40's and the tires are Toyo Proxys. they hold max 50lbs, and the stocks are suppose to be at 32. Does anyone know if since they are low profile they should have more in them?? I didnt know if I was suppose to keep it at OEM specs or put more in them. I have been known to hit big pot holes and put as to what I refer to it as softballs or baseballs in my tires. U know when the sidewall has a big lump in it. I didnt know if this was due to over inflation and then hitting a hole. I usually kept my tires at 40 psi, but dont want to ruin these. Is there a general rule of thumb??

08-15-2006, 03:07 PM	#2
SimmZ Drives: 2k3 Cavalier & 2k2 Echo Join Date: Aug 2006 Location: Quebec Posts: 260	The tire pressure doesn't have nothing to do with tires kind or brand. It have something to do with the car model/brand. Check in your driver's door, you probably have a sticker with many information on your vehicule including paint color code and recommanded tires pressure. Some vehicule will require a different pressure for front and rear. On my old Nissan Sentra 2003, Nissan recommand 31 PSI in front and 33 PSI in rear... Most of vehicule will recommand 32 PSI all around. No matter which tires used. __________________ 2003 Chevy Cavalier Ecotec - His car! 2002 Toyota Echo Sedan - Her car... FOR SALE!

08-15-2006, 03:24 PM	#3
MWill517 Drives: '07 Yaris Sedan Barcelona Red Join Date: Jun 2006 Location: Georgia,USA Posts: 94	If you over inflate your tires, it can cause excessive stress on the tire. That can also cause the tire to wear in the center prematurely. The "baseballs" you refer to are likely from the steel belts breaking and causing a bubble in that spot. That too can be a result of over inflation and / or hitting a big pothole. In either case the tire is degraded and more prone to blowout. I can only recomend inflateing to the recomended pressure that is on the tire. The manufacturer tested and has rated it that for a reason. There are cases that slightly higher or lower pressure is not bad. Sometimes in the winter with ice on the roads, a lesser pressure may give you a small amount more traction. Answering the pressure question, different tires do require different pressure. For example, my bycycle tire states max 60 psi. Some tires are rated at 90 psi on large trucks. I Hope that was of some use. Last edited by MWill517; 08-15-2006 at 03:38 PM.

11-04-2006, 08:54 PM	#6
Black Yaris der Zeck View User's Garage Drives: '05 Audi A4 1.8t quattro Join Date: Sep 2006 Location: Toledo, OH Posts: 5,231	I know this is an old thread, but I though it to be important to respond... stock tire pressure us 30psi on the 185/60r15's, this is because 30psi can hold X amount of lbs safely..... when you change your tire/wheel size you need to determine how much pressure with hold the weight of the vehicle... I have a guide at work that will give you how much weight each size tire can hold at each air pressure... BTW to get past the "cold" air pressure, as stated above, switch to Nitrogen, it is a larger molicule and does not expand and contract nearly as much as normal air... who ever told you to run 41-43 psi in any tire on a Yaris has a big 'ol doober in one hand and crack pipe in the other.... __________________

11-05-2006, 12:37 PM	#7
Black Yaris der Zeck View User's Garage Drives: '05 Audi A4 1.8t quattro Join Date: Sep 2006 Location: Toledo, OH Posts: 5,231	you actually should drop the airpressure from stock when going to larger wheels... I was also wrong about the stock air pressure, it is 32psi... but I run 30psi of nitrogen in both sets of wheels on 225/50vr15 and stock tires and wheels __________________

08-15-2006, 03:33 PM	#4
riceboy Drives: icebox Join Date: Apr 2006 Location: CAN Posts: 1,003	Try talking to your installer to find out ideal psi.. never over or under inflate.. doing that can really take away from your cars overall stability..

08-15-2006, 04:26 PM	#5
slvryaris View User's Garage Drives: 2007 Yaris Sedan S Join Date: May 2006 Location: Indiana Posts: 885	I found this on Toyos website. The Yaris call for the stock tires at 220kga at 32psi and my Toyos will hold 545 at 50psi which is the max. SO I thougt that since the stocks were at 32 at 220 that if you compared the two then the Toyos would neeed at least 27-30psi to make the 220. Any tire that you install on a vehicle must have EQUAL or GREATER load capacity compared to the tire originally installed on the vehicle by the manufacturer. Failure to follow this fundamental rule may result in tire overload, tire fatigue and sudden failure leading to an accident. The ability of any tire to safely support the vehicle load and driving forces is TOTALLY DEPENDENT ON THE INFLATION PRESSURE. All replacement tires must be inflated to a level that will provide at least EQUAL load capacity compared to the tires originally installed on the vehicle. Always refer to the vehicle's TIRE INFORMATION PLACARD to determine the original tire size and recommended inflation pressure. Some replacement tires may require higher PSI to achieve load capacity equal to the original tire. Refer to the load and inflation charts included here to determine correct inflation pressure for replacement tires.

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