Shock Talk Episode 34: Tire Truths - P Metric vs. LT

[@user-js3sl1qd4z]

Thanks for putting these videos out there, they are very informative and I have learned tons from y'all. I don't know that it is always advisable to use the tire pressure on the door sticker when going from stock P-metric tires to LT-metric or LT Flotation. I went from a P275/55R20 111H to a LT275/65R20 126/123S E. In my case, I continued to use the pressure that was on the sticker and the shoulders of all 4 tires wore quickly. I found Toyo's 'Application of Load Inflations' recommended about 10 more PSI of pressure. Although 'ride quality' is a highly subjective topic, I can say that the LT tires sure do help make the whole truck ride way bumpier.

[@timmypivonka1986]

These guys are way off and spreading bad information. Tire pressure is determined by size, load rating, and weight of the vehicle. That information can be obtained from a load inflation index table. It's an industry standard, not just a Toyo thing. It applies to all tires. Typically, a larger tire will require less pressure.

[@ComeandDriveIt]

Spends 30+ minutes repeating the same complaint rather than actually putting data and education into the podcast. Show examples, what’s the tire spring rate of a C vs E? at 18 PSI, 40 PSI, at max pressure? What’s the piston max accel difference between a P and LT? P series also has load ratings … P235/40R19 96V has an extended load rating of 96, meaning it’s similar to an LT in that it has a reinforced carcass / sidewall. C / E / F are all relative to the tire pressure, not the actual load it can take. An LT245/70R16 F rating won’t hold the load that an LT315/70R17 C will. Deeper info, less complaining about dumb customers, leverage your data to inform.

[@anthonytrujillo7971]

I think you guys need to talk to some tire manufacturers and have a rep come sit down and explain things to you guys. Not every e rated tire gets pumped up to 85psi. There are load range e tires that have a 55psi max. Different load range tires require different pressures to carry the same load. You cannot simply go off of the door jam for every single tire out there. For example, a load range E ko2 will actually have less load capacity than the factory p tire you're replacing it with on a 4runner when under inflated to the door jam spec. You guys talk about blown out shocks being dangerous then tell people to underinflate their tires so your shock feels better. That's even more dangerous than blown out shocks.

[@timmypivonka1986]

These guys are way off and spreading bad information. Tire pressure is determined by size, load rating, and weight of the vehicle. That information can be obtained from a load inflation index table. Typically, a larger tire will require less pressure.

[@mikepalermo6686]

Could not agree more with this. It all comes down to the right tool for the job. Why sacrifice ride and lug around rotational mass when it’s not needed.

[@timmypivonka1986]

You do not follow the door sticker. Once you change any variable of the tire that goes out, the window. Size, load rating, vehicles weight all affect the tire pressure. Look at a load index inflation table. That is how you get the pressure. The door sticker only applies with an OEM equivalent tire.

[@nicsimon2575]

Is it time to start talking about universal shocks with the zone control stuff yet...? please?

[@augustbilstein2351]

What size do you need?

[@Agent_Lunicorn]

@@augustbilstein2351August will 8112’s for the 5th gen 4Runner get the DSA+?

[@Jim-s6i3b]

Have a 4Runner KDSS with Wildpeak LT 265/70 17 tire for overlanding/off-roading. My ride is good and suspension works well, doesn’t fill stiff at 44psi on highway not loaded. Wildpeak says 44psi cold. Noise is minimal. Don’t understand bad ride comments. Does not run terrible. Happy. However, going to upgrade my suspension. 6112 and 8100 bypass, new rear springs. Most of added weight in rear. Hopefully will ride better when fully loaded. Also upgrading brakes. Will get back after upgrades. Main comment, runs great on highway for hours when empty. Strongly disagree with comment no E rated tires for 4Runner.

[@timmypivonka1986]

@bilstein you are completely wrong about the pressure. Once you change any asspect of tire or even the weight of the table that no longer applies. Tire pressure is based upon the weight on each axle, the tires load rating, and the size. You need to educate yourselves on a load inflation index table. It is the industry standard.