Determine Tire Pressure for NonStock (NonOE) Size Tires either Plus-Size or Larger Offroad Tires
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- เผยแพร่เมื่อ 8 ต.ค. 2021
- Learn how to determine the proper tire inflation pressure for your car or light truck using Stiles Automotive 3 Methods, Book Method, Caulk Test Method, and Tread-depth Method. In my advanced video I will talk about background information so you understand how and why we are doing this process. I talk about sidewall information, Max Inflation Pressure Max Tire Load, and Load Index. I teach you how to use the Tire Inflation Pressure Load Charts, the Caulk Test Method, and how to measure Tread-Depth and determine Tire inflation status. Every car enthusiast knows Tire Pressure effects Tire Performance, and keeping the correct air pressure in your tires is an important part of vehicle maintenance, because it helps with: Safety, Optimizing tire performance, Improving fuel economy, Improving handling and performance while driving, Extending treadwear, Maintaining steering response, Improving cornering ability and stability, Improving steering precision.
Recommended Tools:
Tire Pressure Gauge (Heavy Duty) amzn.to/3lp1Njd
Tire Pressure Gauge Slime (Digital) As Shown amzn.to/3oHlbKl
Tire Tread Depth Gauge (Green) 2pk amzn.to/2X1Q28w
Or Better, LCD Digital Tire Tread Depth Gauge amzn.to/3l7J7TM
Infrared Thermometer 1080 Non-Contact Digital Temperature Gun amzn.to/3lppuaR
Consumables:
Air - when required
Portable Air Tank with 50" Hose, 11 Gallon amzn.to/2VrjhRE
Or Better, Air Tank 5 Quick Connect Couplers 10-Gallon amzn.to/2Xck7Tl
Sidewalk Chalk,20Pcs 7Colors with Portable Bucket amzn.to/2YwbAe7
References:
octopup.org/car/tires The Author has collected the load tables from the Rubber Manufacturers Association, as well as various tire manufacturers below
tirepressure.com/charts
www.bfentirenet.com/product_c...
Determine and Check Tire Pressure (Basic, on stock size tires) • Determine and Check Ti...
Nitrogen versus Compressed Air, More Tire Pressure Basics • Nitrogen versus Compre...
My Channel - - / @stilesautomotive
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Disclaimer: The information, demonstration and any content contained in this video is for informational purposes only. Due to factors beyond the control of the author, I cannot guarantee against improper use or unauthorized modifications of this information. The author assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. The author recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of the author, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not the author. The links on this video to products are for informational purposes only and in no way are an endorsement of the safety or effectiveness of the particular product. Therefore, viewer agrees to release, waive, and discharge the author or anyone affiliated with the author or video, from any and all liability, claims, demands, actions, and causes of action whatsoever arising out of or related to any loss, damage, or injury, including death, that may be sustained by the viewer, or to any property belonging to viewer, regardless of whether the loss is linked to the use of the contents of this video, or otherwise and regardless of whether such liability arises in tort, contract, strict liability, or otherwise, to the fullest extent allowed by law. - ยานยนต์และพาหนะ
Great information!
Everyone: this guy knows what he's talking about , if you had any doubt. Do what he says !
Off-Roading Guys, I appreciate the comment, I often do a lot of work for little reward. Feedback / Endorsements like this make all the difference! - Stiles
5-Stars! ⭐⭐⭐⭐⭐
Top, I appreciate the feedback! - Stiles
I’ve got 35x12.50r20’s on my f-250 4x4. I like 55psi in all 4 for everyday driving. Firestone destination MT’s. OEM Pressure says 275/65r20 stick with 60psi in the front & 65psi in the rear.
Now when I get in bad mud in ranches, I’ll drop down to 32psi. Best grip for the MT’s. My father always told me 80% of the max psi is a good general rule of thumb for regular driving. I’ll see how well these hold up.
Mark, That sounds about right for your F-250, and 80% does put you in the ballpark. Think about it this way, if you add a 500 lb Toolbox to the bed of your Truck and keep it there for normal use, you want to add a psi or 2. And if I put those same Firestones on my lighter F-150, I'd need to run closer to my BF Goodrich Tires, around 40 psi. If you monitor your Tires over time, you will know if you are running the right pressure. I appreciate the comment! - Stiles
@@StilesAutomotive yeah, f-150’s don’t weigh to much. I’m hoping I can keep these 35’s at 55psi & they still pull well in mud & sand without having to bag them. Those 275/65r20’s I had to bag constantly because of mud & sand. I use to keep my F-150’s at 30psi & they did well. Unless I had to hook to something heavy, then I’d bump them up but those were 285/75R16. Bridgestone Duller AT’s (before they changed the pattern).
I’ll have to get them to lower the PSI sensor. I’ve noticed mine are cold 53psi & hot they’ll get up to 58.
Thanks for the info. very thorough !
I think I have the same type of tires you have for the F150. I was trying to determine the PSI on an F350 but can't seem to get the right number. I think I need to try the Caulk method. Can you provide any additional tips for my F350. Should I use 43 psi like yours ?
Eli, If you do have the Same BF Goodrich All-Terrain KO2 Tires (Same size too), just my best guess; I think 43 to 44 psi in the front and 41 to 43 in the back (if running an empty Bed). You are welcome and I appreciate the comment! - Stiles
Always wondered if the psi would need to be changed from stock tire.
My stock tire psi is 35 for p255/55R19 SL load rating
New tire psi is 27 for 245/65r17 Xl load rating
for 2023 mazda cx5
Magoo, Yep, Tire pressure effects Tire Load Rating and Tire performance. - Stiles
I went from 275/55R20 Pirelli Scorpion ATR Tires to BFGoodrich LT275/55R20 AT KO2. Would all this data on psi apply to my setup?
Harris, I reference the 2 Tire Manufacturer Websites and it looks like the Load Ratings of the 2 Tires is very similar (Load Index: Pirelli 113, BFGoodrich 115). Although the tread is very different the Load ratings are similar, so I would start with the same pressure that you were running with the Pirelli. - Stiles
www.pirelli.com/tires/en-us/car/catalog/product/scorpion-atr/275_55-r20
www.bfgoodrichtires.com/auto/tires/all-terrain-t-a-ko2?cid=PSH%7CSEA_AMN_USA_ENG_DEF_AO_202111_NA_NA_BRND-KO2_NA_MSFT-ALL%7CMICROSOFT%7C%7Cc%7Cbfg%20ko2%20all%20terrain%7Cp%7C&MICROSOFT&SEA_AMN_USA_ENG_DEF_AO_202111_NA_NA_BRND-KO2_NA_MSFT-ALL&&msclkid=f9d24055803d132547d4259b0307ffd0&gclid=f9d24055803d132547d4259b0307ffd0&gclsrc=3p.ds
So my suv has 35" at tires but it rides way to stiff and jarring. Rear is 50 psi for 500lbs of weight added and front is 45...
Raptor, It's hard to say without knowing the suspension modifications you have done (and the actual tire you are running). Do you have urethane bushings? A couple of psi over inflated makes a big difference in my F-150, like at 43 psi that I did for one section of the video, steering is lighter and is a noticeability rougher ride. Did you try the information in my video? Sounds like too much pressure. - Stiles
I am doing something pretty similar to you but keeping the same size of tire basically but the load rating is increased to E. That is higher than my stock tire load rating, do I use the same charts if just the load rating changed? People must drive you insane with all the questions! haha
Mark, My best quess is that you would fun the OEM recommended pressure. It maybe 1/2 psi to much, unless you added weight to your Truck. You have to find the Load Rating Chart for your Tire Model and Tire Manufacturer. Yep, if I'm out of town at all, I get behind and its hard to catch-up with questions; I like helping people! - Stiles
From just the tire pressure reading on the dash I can tell the pressure might increase by 3 psi when hot. Since most drives are long enough to warm the tires and then continue at that temperature, how should we adjust for this?
Olegig, Ford tells us; The recommended inflation pressure is the "cold inflation pressure" found on the Safety Compliance Certification Label (affixed to either the door hinge pillar, door-latch post, or the door edge that meets the door-latch post, next to the driver’s seating position). The "cold tire pressure" is the tire pressure when the vehicle has been stationary and out of direct sunlight for an hour or more and prior to the vehicle being driven for 1 mile. You should not adjust for the change in pressure, however, if you are traveling and need to add air to your tire(s), you should keep this information in mind when adding air. - Stiles
@@StilesAutomotive ok, on my Tacoma it says 30# cold. Then after highway driving their up to 33. Then I hit the trail and air down to 20, but after a cold night of camping they are down to 17. Should I air up to 20 and then when warm recheck and adjust?
@@olegig5166 Yep, I was referencing Ford for normal highway driving air pressures. If you have determined 20 is what you want to run offroad, then yes I would check them after some use. You don't want the Tire rolling off of the Rim. If you know you want to run 20 psi, you may have done this, but I would find people with similar weight vehicles and my Tires and find out what pressure they are running and under what conditions (warm or cold). - Stiles
@@StilesAutomotive thanks