Tire pressure - Mazda CX3 Forum
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post #1 of 29 Old 09-27-2016, 09:25 AM Thread Starter
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Tire pressure

What tire pressures do you run on the 18" oem wheels 215/50/18. Also street vs offroad vs load
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post #2 of 29 Old 09-27-2016, 11:11 AM
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Originally Posted by jeffmps View Post
What tire pressures do you run on the 18" oem wheels 215/50/18. Also street vs offroad vs load
In my memory, Mazda's manual recommends:

- 2 to 3 person: 33 psi for rear and 30 psi for front tyres
- Full load: 40 psi for rear and 38 psi for front

You can check this information on your driver door or in manual
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post #3 of 29 Old 09-27-2016, 06:32 PM
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The manual for my US-spec CX-3 says the following...
USA/Canada: 36 psi front and rear regardless of load, AWD/FWD and conditions..
Mexico, AWD with up to 3 persons: 33 psi front, 33 psi rear.

I wonder if the Mexican market gets different tires or if they think we're weird north of the Rio Grande.

I drive mine on-road with at most 2 people, a 50lb dog an a trunk full of groceries and they're currently set at the recommended 36 psi because I haven't bothered to put marks across the tread to see how they wear at different pressures.


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post #4 of 29 Old 09-28-2016, 01:51 AM
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Hope this helps
Attached Files
File Type: pdf Tire air pressure spec.pdf (115.9 KB, 888 views)

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post #5 of 29 Old 09-28-2016, 02:08 AM
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NotAPreppie said: "The manual for my US-spec CX-3 says the following...
USA/Canada: 36 psi front and rear regardless of load, AWD/FWD and conditions..
Mexico, AWD with up to 3 persons: 33 psi front, 33 psi rear".

Most times I have 2 on board, other times 3/4. So, I simply run 36 psi alround. Easiest way I think.

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post #6 of 29 Old 09-28-2016, 12:12 PM
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Quote:
Originally Posted by Levi3xt View Post
NotAPreppie said: "The manual for my US-spec CX-3 says the following...
USA/Canada: 36 psi front and rear regardless of load, AWD/FWD and conditions..
Mexico, AWD with up to 3 persons: 33 psi front, 33 psi rear".

Most times I have 2 on board, other times 3/4. So, I simply run 36 psi alround. Easiest way I think.
TBH, within certain reasonable limits, I doubt it matters much (unless you're driving a late-90's Ford Explorer rolling on similarly aged Firestone Explorer AT tires, then you'll probably die).

If you really want to determine definitively the best pressure for your particular use, do what the autocrossers do:
  1. Load up the car
  2. Set the pressure
  3. Drive around for a whlie
  4. Measure the temperatures at three points across the tread width (inside shoulder, middle and outside shoulder)
    You can buy a fancy needle pyrometer or just do what I do when racing: use an FDA-approved narrow-tip meat thermometer.

Higher temperatures in the middle mean pressure is too high. Higher temperatures at the shoulders mean pressure is too low. You may have to average the shoulder temperatures because many cars come with a little bit of toe-in and negative camber and that can cause the inside shoulder to warm up more than the outside. Also, high-speed cornering will cause the outside shoulder to heat up more than the inside shoulder.

The easier but less reliable way to do this is to take some high-temperature, brightly-colored grease pencil and make a broad stripe across the width of the tire. Set the pressures that give even the wear across the width of the tread.
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post #7 of 29 Old 09-30-2016, 02:39 PM
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My car says 33 psi rear 36 psi front. Open the driver side door and it is right there. I haven't checked the manual, but if others are saying the manual says 36 all around, why the discrepancy??

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post #8 of 29 Old 10-01-2016, 05:10 AM Thread Starter
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Thanks for the replies. Was just keen to know what people actually run vs the manual
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post #9 of 29 Old 10-03-2016, 03:22 PM
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I took my car to service the other day and after getting home I checked my tire pressure, all tires were at 38 psi. They were at 36 this morning being quite a bit colder. So I guess I'll try to keep them all at 36, even though the door sticker says 33 for the rear.

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post #10 of 29 Old 10-04-2016, 02:45 AM
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The rule of thumb is that you gain about 1 PSI for every 10˚F temperature increase (or lose about 1 psi for every 10˚F decrease).

This is why it's good to check your tire pressures after that first big cold snap (or heat wave) of the season.

Also, your tire pressures will increase after driving (potentially quite a bit if you were driving on a twisty mountain road or race track).
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2016 CX-3 GT iAS AWD, Soul Red Metallic on black
2017 MX-5 RF Launch Edition
2005 RX-8 Sport Sunlight Silver under Cone Rash (because racecar!) -- SOLD!

Science adjusts it's views based on what's observed.
Faith is the denial of observation so that belief can be preserved.
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