How to Set Proper Tire Pressure In Your Truck With the Chalk Line Test
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- Опубликовано: 18 янв 2023
- Looking to improve tire wear and ride on your truck with aftermarket tires? In this video we explain tire pressure theory, load inflation tables, and walk through how to use the chalk line test to dial in tire pressure for your exact truck!
#howto #tirepressure #chalklinetest 
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Please keep in mind every truck and tire is different, so you need to consult your tire manufacture's specs. Have a tire pressure light? Here's the fix:
AEV ProCal for Ram: www.cjcoffroad.com/search?type=product&q=ProCal
Alpha OBD for Ram: www.alfaobd.com
FORScan For Ford: forscan.org/home.html
I didn't hear a word you said... just staring at that beautiful beast of a PW the whole time.
I have never heard of doing this. I will be doing this to figure the pressure needed my truck. Thanks for the video.
Glad to help
This is why you guys are the best! My customers always freak out when I say 50 on the front and 40 on the rear. And it looks like I need to go take a second look at the tread! Because I can go lower
I ran 25psi on the street with my 37x12.5 BFG KM2s on '13 JKU. And 8psi off road. This is a great method
Great video and information!
Thanks for the tips, Cole!!
VERY Helpful! Thanks
Patiently waiting for some whoop pounding vids 😊
Good info, Thanks
I did this test on my Tacoma on 33 general grabbers and I got 65k miles out of them
What i like to do is use that load inflation calculator. My previous tire was a 245/75r16. I went to a 285/70r17. I got on toyos website and i found the weight capacity of the stock tires at the stock psi. I then went to the new tire size and found the tire psi that matches the factory load capacity. Which in turn dropped my fronts 12 psi and rear 20 psi. So with the new tire psi i can have the same load capacity as factory. I can go lower for sure but i do like to know my factory rating so when i tow max capacity i know what psi to run.
Appreciate the video! Btw, can you tell me what tire gauge you are using? Looks nice.
This is a good video on the pressures. My 4th gen wagon with the same tire is 35/28 for a perfect line across. Which is wild to think about.
I like to air down to 25f and 20r off-road. The Toyo is great however it seems that the newer us made toyos pop easier than the older japanese made ones.
@Such Is Life 37x13.5r17 Toyo MT
So did this truck end up with 36/32 f/r like the dash read?
👌
Great video. Why do we need to test 4 tyres though? Isn't it enough to check one front and one back?
We always like to check all four just to be safe, but yes you can do just one front and one back.
What’s the backspacing on those trailready wheels? I’m looking at running 17x8.5 with a 5.5 backspace and a 37x13.50 Nitto ridge grappler but I’m trying to keep the tires flush with the fender flares on my 5th gen PW.
This particular truck is 0 offset and 4.75" backspace, but you want 5.5" to be flush with the fender.
Is there any information to be said about airing up the tire to maximum pressure when seating the bead and potentially differences in the way the tire balances at different air pressures? Should they be re-balanced once you find your final pressure setting, especially if they were initially balanced at maximum pressure?
Ideally pressure shouldn't really impact balance unless something is wrong with the tire.
How to reset the low pressure alarm on Ram to allow for something in the 40 to 50 range?
We discuss it in this video, but you can use Alpha OBD, or the AEV Pro Cal modules we sell on our website. It's actually super simple!
Question.. to do the chalk test, you need to get the tires up to running temp first, right?
We usually like to do it with the tires warm after driving
I pulled up the toyo chart for 37x12.50r18 AT3s and 25psi equals 2095lbs rating per tire. Ignoring for conversation sake front to rear weight distribution that’s 8400lbs of support which is what my truck weighs. That would put me at an average of 25psi per tire. That’s WAY less than CJC or Carli has ever recommended. Am I missing something here? That would probably equate to something 28psi front and 23rear 😮
The load inflation table doesn't lie. We usually say 45 front and 40 rear as a start since that's a pressure anyone can run and tow, but the load inflation table and chalk line test give you a true answer for your exact tire.
Great information. I have 33x12.5 x18 on a chevy silverado. My tire says 65psi cold seems alot could I run 40 psi without any issues?
I have 37x13.50R17E on 17"x9" on my '23 Super Duty, with snow plow prep package. I ordered online & they showed up with 40 psi in them. I ran them up 60 up front 62-63 in the rear. Right now it seems over inflated, "ridging out" & stiff. They are rated for 65 max psi. I was just trying to meet stock tire pressure, 40 seemed too low, though I can't say they didn't ride good. My truck once completely outfitted with tools, topper, aftermarket bumpers, & likely airbags will be about 9800 lbs. Right now it's not much heavier than stock, maybe 300lbs over. Any recommendations? Is 40 psi fine? 60-63 psi too high? I know the 9" wide rim will give the 13.50" a little more pucker than a wider rim.
60 psi is way too high! That said, every truck is different, so follow the tutorial outlined in this video and you'll have an answer for what your exact tire should be at front and rear.
@@CJCOffRoad Sure thing. I dropped it down to 50 in the front & 55 in the rear & am look to examine the chalking my crushed concrete drive way naturally affords.
We'd recommend no higher than 45 front 40 rear as a start, but you'll likely land around 40 front and 30 rear.
@@CJCOffRoad Ok. I always thought, assumed more psi up front. I did a quick math equation & got about 49 lbs per psi based on 65 psi gave me 3195 lbs per tire. Thus if the truck weighs in at 7500+ empty, maybe 500 lbs over stock, then 40 psi up front & 45 rear gives me about 8300 lbs. Thanks for the help. I'll make some further adjustments. Then when I get my tools & topper loaded up I'll check my weight & adjust.
Im running a 150 ford on 35×12.50×18 38psi fronts and 30 in back toyo rts ?
Did you figher out the correct pressure? I have a 2023 f150 as well 4x4 on 35sx18 I don’t haul, mainly cement princess but I am confused about the pressure
@@gman0812 I'm running 40 in front and 37 in back
@@charles17508 Thanks!
Okay wait , I thought if the chalk is darker in the center then the tire is under inflated and if darker on the outside over inflated.
Curious - I have a full Carli pintop with king shocks on a 22 superduty - 37x13.5x17 nitto ridge grapplers 0 offset - what PSI should these tires be set at?
It all depends on the weight of your exact truck and setup. Just grab some chalk and you'll have the answer!
They talk about running lower tire pressures to make the suspension kits ride better. You can do the same exact thing with stock, suspension run low tire pressures and save yourself a bunch of money and buying the suspension kit.
Yeah… it’s not the same. Go hit a whoop section with stock suspension and soft tires and tell me how it feels haha.
@@JustDiesels I don't hit many whoop sections on the highway. Actually none at all, I hit a lot of wash boards on gravel back roads and my suspension kit handles wash boards terrible just like stock suspension.
@@JustDiesels he’s not wrong. There’s absolutely no reason to be running 65-80psi unloaded on a stock truck. Especially if you’re in SoCal with our crappy freeways. We did this at the SoCal city I was a fleet mechanic for. But if you want the best of both world a suspension system will really soften things up. Especially on 3/4 ton and up trucks
@@Rangerdnger do the chalk method shown here to find that sweet spot unloaded and then air up when you tow 👍🏼
@@brokenwrench404 I do and it's a pain in the ass I tow quite often
The tire light on truck would n drive me nuts
Just turn it off using the methods we mentioned!
@@CJCOffRoadyou didn’t mention anything for chevys
@@Bcrawf2994just pull the light bulb from behind the dash