Oversized tires, tire pressure light on now - Ranger-Forums - The Ultimate Ford Ranger Resource


Wheels & Tires Semi-Tech General discussion of wheels and tires for the Ford Ranger.
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Old 03-01-2009
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Oversized tires, tire pressure light on now

I just put on my 32x11.5 tires lastnight, and while i was on the highway, the tire pressure light started flashing then stayed on solkid, i checked the pressure, they haven't lost any, is this just becasue stock tires are 32 psi, and my new ones are 45? so it just thinks they are over filled or something?
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Old 03-01-2009
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What does everyone run in their upsized tires? i have 33's i was running like 50
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Old 03-01-2009
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I bet its because they didn't move the tire pressure bands over to your new wheels I bet. I run 30/35 in my 32s
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Old 03-01-2009
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Did you change your wheels?? If you did and didn't transfer the sensors over then that light will come on. Mines on, it doesn't really bother me.
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Old 03-01-2009
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I run 33-35psi in my 32's.
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Old 03-01-2009
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I run 35 front 30 rear with my 31"s.
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Old 03-01-2009
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I run 32 psi in my 31's
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Old 03-01-2009
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Quote:
Originally Posted by 1999Rangerlockednlifted View Post
What does everyone run in their upsized tires? i have 33's i was running like 50
?!?!?!????

****ttt
I'm running like 30 and I want to bring my new ones down to like 20-22, Badkarma runs his 38x1450s at like 18 and 20..
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Old 03-01-2009
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well i put them on myself so i guess thats why, the place that mounted the tires put them at 45 psi, is that too much? seems like the majority here are in the 30's
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  #10  
Old 03-01-2009
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Quote:
Originally Posted by heartsdead View Post
well i put them on myself so i guess thats why, the place that mounted the tires put them at 45 psi, is that too much? seems like the majority here are in the 30's
what does your tire say? my TPMS will be on for ever in my FJ... i popped a tire on the trail and it filled with mud and water and killed my TPMS unit on one of my wheels and its 90$ for a new one so ill just live with the light lol i dont need a TPMS anyways...
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Old 03-01-2009
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Quote:
Originally Posted by ColdNapalm View Post
what does your tire say? my TPMS will be on for ever in my FJ... i popped a tire on the trail and it filled with mud and water and killed my TPMS unit on one of my wheels and its 90$ for a new one so ill just live with the light lol i dont need a TPMS anyways...


the tire will say MAX psi, but there is no real reason to go over stock PSI thats on the door sticker


and TPMS will show a light when its OVER inflated or UNDER inflated.



On my 32s, I'm running what my sticker says,


Also, I put different rims and tires on my wifes liberty with TPMS, and I run the stock 33psi, and the light hasnt came on



Scottg
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Old 03-01-2009
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Run the pressure the door says not what is on the side of the tire that says max. pressure.
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Old 03-01-2009
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so i should air them down to 33 psi or whatever is on the sticker then. the tire just says max 65 psi, doesn't say how much should be there, the tire place set them to 45 psi and i've left it there, the light is annoying though. what difference will there be between 33 and 45 psi?
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  #14  
Old 03-01-2009
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I'm pretty sure the door sticker is just for the stock tire size. With non-stock sized tires a different pressure may be appropriate. I'd start at the pressure listed on the door, then at the first tire rotation see how your tires are wearing. If the middle is wearing quicker than the sides that means the tires are overinflated and you should let some air out. If the sides are wearing quicker than the middle that means the tires are underinflated and you should add air.

If you know somebody that has a similar vehicle and similar aftermarket tire size it would also be good to ask them what pressure they have found to work by experience (which is some of the information that has been given in previous posts).

At 45 psi your tires are probably overinflated and riding high on the center of the tire. Decreasing the pressure should give you better traction and better ride quality. I read something a while ago that said pressures above something like 32 or 35 psi tend not to improve fuel economy so you may not see any reduction in mpg.
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Old 03-01-2009
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Oh one more thing heartsdad...what size rims are you running? For a 32x11.5 I'd assume 15x7 or 15x8? If it's something crazy like a 15x10 rim maybe the tire place overinflated the tires to keep them from popping the bead?
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Old 03-01-2009
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max pressure of 65 is just to set the bead. never run them that high. i have 33s and i run 50 front 45 rear.
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  #17  
Old 03-01-2009
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I read but I don't see where you said if you changed rims or not? The sensor is on the rim and if you swapped rims but not sensors then obviously the light will be on (welcome to the club). When I put my new wheels on I didn't move over the sensors so I have a constant tire pressure light... I don't even notice it anymore... also I run 35 PSI in my 33s.
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  #18  
Old 03-02-2009
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Quote:
Originally Posted by sofa king shifty View Post
max pressure of 65 is just to set the bead. never run them that high. i have 33s and i run 50 front 45 rear.
You're "not supposed" to go over 40 psi whilst setting the bead.

But Max pressure don't mean anything.

I've set the bead of P metric tires at about 100 psi. (low pros)
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  #19  
Old 03-02-2009
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the only thing that i could think that is wrong is that the tire censor was broken when the tires were put on. they are made of a cheap plastic that if you are bnot very careful can break fairly easy. prior to putting on the tire did you check the censor visually and was it ok? if it was then it could have broke during mounting. if you are using a mounting machine you need to dismount the with the valve stem at about 5 oclock if your standing infront of the pedals and approx. 8 oclock. other than that idk what the prob could be
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Old 03-02-2009
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^^And that's IF he's got the sensors still....still hasn't answered if he's changed wheels or not...

I vote even if the sensors are there, they are not calibrated with the new tires which carry a higher suggestion inflation pressure compared to the stock tires.
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  #21  
Old 03-03-2009
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first off, the sensors are not in your new wheels are they? your light will flash when there is a hardware problem (dead sensor battery, broken or missing sensors). if your just over or under inflated the light will be solid.

all you need to do is have your sensors put inside your new wheels. these are banded sensors in your wheels and the bands are not reuseable. you can spend a grip at ford or buy some cheaper aftermarket bands. if the tire shop didnt know you had sensors they are tards, go somewere else. after installing set your tire pressure at the recommended (by ford) pressure. anything over or under (by 20%) will bring your light on. drive 30-40 miles (norm takes less) and whalaa, your good to go.

btw you can not calibrate the sensors to keep the light off at different pressures. DO NOT DO THIS but.... if you really wanna through it off, put all your sensors in your spare and set the spare at 35psi.. and uhhh dont run that spare.. i wouldnt do that on anyones but my own
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  #22  
Old 03-03-2009
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32 PSI in my 32's.

The tire shop people are morons. If they filled the tires to the max on the side of the tire, they are TARDS!
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  #23  
Old 03-03-2009
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Damn some of you run high pressures lol. I run 22 in the front and 20 in the rear.
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  #24  
Old 03-03-2009
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hey sorry guys, i started my apprenticeship schooling this week so im not on as much. uh, the rims are 15x8, they are not my stock rims, so if the sensor is in my tire, i no longer have the sensor. so that would explain the light. It flashes for about 60 seconds then stays solid.
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  #25  
Old 03-03-2009
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BTW sensor is on your WHEEL... not tire... as I said... welcome to the world of the TPS light... it's fun... it's actually a game now for me to see how many dash lights I can get on any once without ACTUALLY trying to get a ton on (btw record is 4... but if I wanted I could get up to 6)....
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