Tire pressure
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Cargo Master
Joined: Nov 2014
Posts: 2,442
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Tire pressure
The rating on the sidewall of our Firestone bias ply tires says 32 psi max. They are staying at that pressure pretty consistently cold. I went for a short drive tonight, maybe 10 miles and then measured them, they were at 35 on the front and 33 on the back. Should the pressure be set at ambient temp or after driving/warm?
JB
JB
Laughing Gas
Joined: Nov 2020
Posts: 992
Likes: 367
From: Republic of Texas
Tire pressure is set at tire cold.
I would also go as far as saying, if you want the correct pressure you need to know what the axle weight is and set presser by weight based on the tire load chart, not by max psi on the sidewall.
If you have a pressure in the manual it is usually based on max payload per axle.
I would also go as far as saying, if you want the correct pressure you need to know what the axle weight is and set presser by weight based on the tire load chart, not by max psi on the sidewall.
If you have a pressure in the manual it is usually based on max payload per axle.
Fleet Mechanic
Joined: Mar 2005
Posts: 1,462
Likes: 185
From: Dedham, MA
Tire pressure is always set cold. If you've driven the car more than 2 miles you should let them cool down for 1-2 hours before you check them again. It may not seem like a big deal but once you get heat into the tires you shouldn't be adjusting pressure unless it's an emergency.
I would agree with Jimmy BUT you have to make sure the tires currently on the car/truck are the correct load rating for the application if you plan on using the tire load chart for a specific vehicle.
Sorry to belabor the point.
I would agree with Jimmy BUT you have to make sure the tires currently on the car/truck are the correct load rating for the application if you plan on using the tire load chart for a specific vehicle.
Sorry to belabor the point.
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Cargo Master
Joined: Nov 2014
Posts: 2,442
Likes: 256
Thanks guys. I drove the truck today set at 28 and it was perfect. Drove awesome. I think at 32, after some heat starts in the tires, I was driving on balloons. I think I have fine tuned everything so that it runs like a top, I even hit the interstate for a few miles and hit 70. Appreciate the advice.
JB
JB
Fleet Mechanic
Joined: Jun 2020
Posts: 1,905
Likes: 763
From: Hillsborough NJ
Thanks guys. I drove the truck today set at 28 and it was perfect. Drove awesome. I think at 32, after some heat starts in the tires, I was driving on balloons. I think I have fine tuned everything so that it runs like a top, I even hit the interstate for a few miles and hit 70. Appreciate the advice.
JB
JB
Read the Ford Manual
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