12-23-2015, 05:13 PM | #1 |
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Tire Pressure
What is the proper tire pressure for a 4.50 x 21 tire?
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12-23-2015, 05:28 PM | #2 |
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Re: Tire Pressure
I use 35 psi for 19's
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12-23-2015, 05:44 PM | #3 |
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Re: Tire Pressure
I use 35 for my 4.50 x 21.
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12-23-2015, 06:40 PM | #4 |
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Re: Tire Pressure
I only use digital gauges on everything even my lawnmower . With the TPMS now on most cars it's a must have to be precise.. The old school pop sickle sticks are a thing of the past
Last edited by Mitch//pa; 12-23-2015 at 06:50 PM. |
12-23-2015, 06:46 PM | #5 |
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Re: Tire Pressure
You can't go wrong with 35 p.s.i. Wayne
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12-23-2015, 06:46 PM | #6 |
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Re: Tire Pressure
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12-23-2015, 06:53 PM | #7 |
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Re: Tire Pressure
I hear ya Rod,,and I bet those monkeys don't know that if you look in the door jamb on any car it gives you the reccommended PSI for that particular application. Every car we look to see before airing...
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12-23-2015, 07:07 PM | #8 |
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Re: Tire Pressure
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12-23-2015, 07:28 PM | #9 |
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Re: Tire Pressure
I never thought of it that way
What does your Model A state in the door jamb for tire pressure Last edited by Mitch//pa; 12-23-2015 at 07:37 PM. |
12-23-2015, 08:26 PM | #10 |
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Re: Tire Pressure
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12-23-2015, 10:24 PM | #11 |
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Re: Tire Pressure
Mitch, I get the TP (tire pressure) but what is the MS. I have always gone by the max pressure on the tire wall and kept it a few Lbs under. The door jamb pressures are too low and the tires wear out at the edge of the treads, AND your gas mileage suffers!
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12-23-2015, 10:38 PM | #12 |
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Re: Tire Pressure
That seems to be the case with tire pressure specs since the Ford Explorer rollover recall in the late 90's. Most was attributed to tire pressure specs being high. I was working for Monroe shocks OE. Our shock valving specs for Ford changed somewhat in the aftermath of this as tire pressure and shocks work together for a smoother ride. Also with the investigations several lawsuits were filed against Tenneco the parent company of Monroe shocks. All were dropped at some point, but still caused undue stress at work as we were under intense scrutiny from Ford as they looked to point the blame in any direction but their own. Rod
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12-23-2015, 11:04 PM | #13 | |
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Re: Tire Pressure
Quote:
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12-24-2015, 06:08 AM | #14 | ||
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Re: Tire Pressure
Quote:
Quote:
Terry each particular vehicle manufactured is tested with a certain tire, vehicle weight and other parameters etc etc.. The recommended pressure is on the sticker... the TPMS is then set with its parameters which will usually turn the light on at about 6 PSI below the door spec... That being said yes I agree I see certain vehicles that wear tires improperly at the recommended pressure. Compensating for that is ok but as a main setting use the door spec and not the sidewall on most cars. The sidewall spec is max pressure cold for any given tire. Example the new GMC 2500 HD's ---3500 HD's has a door spec of 65 frt and 80 rear.. At those pressures the tires will wear the centers badly because I am not usually carrying a load or trailer most of the time. They recommend that assuming your always loaded. Pretty ass nine system on certain applications I agree.. I run 55 PSI in the frt and 50 PSI in the rear unloaded until I put a load or trailer on then I put the rear up to 80 PSI. It rides like a rock unloaded at the higher spec also. Lowering the pressure to these specs turns on the TPMS light cause it's more than 6 PSI lower than the factory spec. What I did is recalibrate the system with my scanner so it recognizes the lower threshold and stays off... My 1930 Model A, I have yet to have a TPMS light activate for over inflation. What type of vehicle does that happen on? And how much over the spec are we talking? Last edited by Mitch//pa; 12-24-2015 at 06:52 AM. |
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12-24-2015, 06:21 AM | #15 | |
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Re: Tire Pressure
Quote:
Rod thanks for the info Last edited by Mitch//pa; 12-24-2015 at 06:49 AM. |
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12-24-2015, 07:09 AM | #16 |
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Re: Tire Pressure
Not many Explorers were sold here. I was told that the problem was the load rating was dropped for a better ride. The authorities here are strict on load ratings, not so much speed rating.
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12-24-2015, 07:29 AM | #17 |
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Re: Tire Pressure
Presumably, My 2013 Ford Transit! It had a soft tire when I first got (brandy New!) and I filled the tire and pushed the pressure up to my specs, not their specs. This seemed to have triggered the sensor from the low side to the high side of it's range. Now the light is permanently on and can't be turned off. I ignore it! I never wanted it in the first place! I've never needed one in the past.
Terry My 1930 Model A, I have yet to have a TPMS light activate for over inflation. What type of vehicle does that happen on? And how much over the spec are we talking?[/QUOTE] |
12-24-2015, 07:45 AM | #18 |
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Re: Tire Pressure
Here is some good info, also about over inflation and the TPMS ....
http://www.tpmsmadesimple.com/faq.php Terry,, on the fords you just need to relearn the system with a hand held remote which is available on eBay for around 10.00.. I can help you do that if you get it.. Over inflation warnings are not mandated by the federal TPMS act ... But as mentioned by My ModelA::: some may do that... Learned Tire position is also critical on some of the systems Last edited by Mitch//pa; 12-24-2015 at 08:25 AM. |
12-24-2015, 09:10 AM | #19 |
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Re: Tire Pressure
I run 30 psi in my 4.50 x 21 tires. The car doesn't wander near as much as when I was running 35 psi. Someone on this site recommended the 30 psi to me. I use a good quality 0-60 psi gauge that correlates well with the TPMS system on my new F150
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12-24-2015, 09:33 AM | #20 |
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Re: Tire Pressure
I usually run 2 lbs less in the left side tires so the crown in the road doesnt make it pull to the right as much. I usually run 33 and 35 if the weather is colder, but drop it to 32 and 30 in the summer when the road is hot because it will build up more pressure as you drive. I always check the pressure cold, before the car is driven for the day.
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