Road Trip Tire Pressure

35 cold all the way around. Check the spare tire too.

 

Do the chalk test as you will be loaded for travel, on cold tires. The answer isn't really 'front vs rear', the answer is about the most even contact patch. Odds are you may wind up with a few more lbs in the rear if you have the rear loaded up.

Whatever you wind up with for your highest pressure, put 5 more Lbs in your spare. If you need it, it's easier to lower the pressure for the particular axle than worry about raising it somewhere after a change.

Regardless of the anecdotal evidence offered here, the advice is poor. Don't do it. Google will find you lots of info on the topic. Here's a sample.

https://info.kaltire.com/the-right-tire-pressure-why-the-maximum-isnt-the-best/

Screw up the contact patch with the wrong pressure and you give away grip, the thing that creates the most safety a tire can offer.

 

35 on all 4 is a good compromise between ride, wear, and mileage.

 

That just means you have E load tires. That's the MAX you should run if you're loaded down to the max weight of the tires (which a tacoma can't handle anyway, lol)

I've put 100+ thousand miles on E load tires at 30-35 psi with no adverse tire wear.

 

I know two methods of calculating the optimal tire pressure:
1. charcoal = empirical. Takes some time but does not require special tools or knowledge
2. Door sticker + calculation. Door sticker gives the vehicle weight, tire type and pressure. From that you can easy calculate the load factor. Knowing the load factor of the new tire (tire max allowed load and tire max allowed pressure) you can easy recalculate the pressure for the trie different than what is on the door sticker.

I am to lazy to use charcoal method, so I use calculation. When I switched from P-type stock size Michelin 235x75/R15 to LT-type KO2 30x9.5/R15 (the biggest I could fit on my 15x6 rims) I calculated the KO2 pressure at 30psi front (Michelin was 26psi) and 33psi on rear (Michelin was 29psi). That is with my normal weight. Calculation shows that for fully loaded truck at maximum gross weight I should go for 33psi front and 35psi rear. All from excel spreadsheet

 

Thank you

 

I don't have much experience with different brand of tires but KO2. For the same size KO2 there is not much difference in operating pressure for 4Runner between E and C. E tire can be inflated to higher pressure and therefore can take more load but for the same load the calculated pressure is the same. E has benefit of being stronger so it takes rocks better but also stiffer so less comfort on highway.

 

I run 35 psi all the time. The tire shop filled em to 55 psi one time. The brakes felt super weird as there wasnt as much road contact, I cant imagine going any higher.