View Full Version : Tire inflation question
davemsc
05-05-2017, 03:06 PM
Hey all,
I have a 2013 mazda 3 GS SKY. Originally, the tires that came with it was the 205 55 16 and the placard on the door says to inflate to 36 PSI.
However, I know run 215 45 17 on the car. Should I inflate them to the same PSI? I initially did but I saw in the manual that the 18 inch tires were supposed to be set at 32PSI, so now I'm not sure.
Thoughts?
Thanks!!
dave
sarujo
05-06-2017, 12:44 AM
You would want to run the 17's at a lower PSI since they are lower profile than the 16's. My 2010 placard for the same 16" size shows 35 PSI and the owner's manual for 205/50/17 @ 32PSI. I personally set mine about 33 to 33.5
kenghk
05-06-2017, 01:28 AM
You'll have to do some math. Click here the link and download this inflation guide. https://www.google.ca/url?sa=t&source=web&rct=j&url=https://static1.1.sqspcdn.com/static/f/589830/23447320/1378330097907/Discount%2BTire%2Binflation.pdf&ved=0ahUKEwiKpOfettrTAhWk0YMKHRoMAeQQFgg8MAU&usg=AFQjCNH6offGIanu3dYSwws2k7Tv4oLDYg&sig2=rh692ce7zIXqjF_iK-jRnw
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SkyActivR
05-07-2017, 07:30 PM
Typically do we go by the door or by the manufacture of the tire?
kenghk
05-07-2017, 08:00 PM
Typically do we go by the door or by the manufacture of the tire?
Neither is as accurate as using the load index. I know it can be time consuming to do it for all customers but it is the correct way.
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My personal experience working on cars, I always follow the tire manufacturer specifications because if you think about it, the tire companies make the tires so they know what the max. pressure should be at. Now I've never had a problem with keeping my tires at 50 psi when they call for 50 or 51 however, some people think it's too rough so 40 psi is a good average pressure to prevent unnecessary tire wear.
Clifford
08-17-2017, 08:06 PM
My personal experience working on cars, I always follow the tire manufacturer specifications because if you think about it, the tire companies make the tires so they know what the max. pressure should be at. Now I've never had a problem with keeping my tires at 50 psi when they call for 50 or 51 however, some people think it's too rough so 40 psi is a good average pressure to prevent unnecessary tire wear.
Not sure if trolling or just misinformed
MikeTheCheek
08-17-2017, 09:34 PM
My personal experience working on cars, I always follow the tire manufacturer specifications because if you think about it, the tire companies make the tires so they know what the max. pressure should be at. Now I've never had a problem with keeping my tires at 50 psi when they call for 50 or 51 however, some people think it's too rough so 40 psi is a good average pressure to prevent unnecessary tire wear.
Do not follow this advice.
The pressure inside your tire will increase as it gets warmer. If you keep your tire pressure right at the max rating and the outside temperature raises 5-10 degrees, your tires will be much higher than the max rating. After a long drive on a very hot day I saw my tire pressure go from 35- 42.
Over inflating/under inflating your tires can also lead to improper and premature wear.
Default User
08-18-2017, 01:46 PM
In 25+ years of owning a vehicle - I've always went by the car specs located in the door jam.
Hyperion
08-18-2017, 03:51 PM
My personal experience working on cars, I always follow the tire manufacturer specifications because if you think about it, the tire companies make the tires so they know what the max. pressure should be at. Now I've never had a problem with keeping my tires at 50 psi when they call for 50 or 51 however, some people think it's too rough so 40 psi is a good average pressure to prevent unnecessary tire wear.That's MAX pressure dummy. You're literally a driving blowout waiting to happen.
Op, anything between 32-36 is going to be fine. You might get an extra 20 km to a tank with 36, 32 might help with a corner. Both negligible.
Set them anywhere in that range, keep them all within one of each other and drive happy.
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Not sure if trolling or just misinformed
Trolling. I don't inflate to 50 because it's terrible. I do go to 40 psi.
morganc
08-20-2017, 07:46 PM
The mazda service manual specs 34 PSI on 225/40/18 and 32 psi for 205/50/17 (gen 2). Anywhere in between there should be fine.
Noisy Crow
08-20-2017, 10:09 PM
Trolling. I don't inflate to 50 because it's terrible. I do go to 40 psi.
Which will wear your tires out faster, increase braking distance, and decrease cornering stability.
http://www.wheels.ca/news/over-inflated-tires-are-a-bad-idea/
sarujo
08-21-2017, 12:19 AM
The mazda service manual specs 34 PSI on 225/40/18 and 32 psi for 205/50/17 (gen 2). Anywhere in between there should be fine.
And my gen2 driver's door sticker states 35 PSI for 205/55/16
That's MAX pressure dummy. You're literally a driving blowout waiting to happen.
Op, anything between 32-36 is going to be fine. You might get an extra 20 km to a tank with 36, 32 might help with a corner. Both negligible.
Set them anywhere in that range, keep them all within one of each other and drive happy.
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Yeah I realize that. Sorry I didn't mean for you take me seriously on that...
Which will wear your tires out faster, increase braking distance, and decrease cornering stability.
http://www.wheels.ca/news/over-inflated-tires-are-a-bad-idea/
Yeah I didn't realize everybody on this forum was a professional racer that pushes their tires to the limit. And that they'll ever notice a difference between 32 psi and 36 psi and etc. I
In 25+ years of owning a vehicle - I've always went by the car specs located in the door jam.
It's funny you mention that because if yoube ever looked at the side of the door on pickup trucks 1/2 ton or 1 ton, they all say 35 psi as well.. so basically you're telling me every car on the road weighs the same and you can have completely different tires on every vehicle with different max pressures, but they should all be 35 psi? I know someone who had an accent with 35 psi max pressure tires. Guess what the door said.. 35 psi. And he kept it on 44 psi, but in the 8 years he's owned it, he never blew a tire or changed them.
Not trying to have an argument with everybody on here shot what tire pressure to keep it at and I'm not gonna sit here and tell you guys you're wrong as confident as you guys tell me that, but you can follow whatever you want. I'm just stating things that are on other vehicles besides mazdas. Everybody has their own opinion.
Noisy Crow
08-21-2017, 01:47 PM
And some people have science.
Hyperion
08-23-2017, 09:28 AM
It's funny you mention that because if yoube ever looked at the side of the door on pickup trucks 1/2 ton or 1 ton, they all say 35 psi as well.. so basically you're telling me every car on the road weighs the same and you can have completely different tires on every vehicle with different max pressures, but they should all be 35 psi? I know someone who had an accent with 35 psi max pressure tires. Guess what the door said.. 35 psi. And he kept it on 44 psi, but in the 8 years he's owned it, he never blew a tire or changed them.Tires meant for trucks have different rubber compound than tires meant for a little civic/mazda.
This billion dollar industry isn't wasting money putting more rubber in a tire that it doesn't need to.
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