How many PSI do you run in YOUR tires?

[basjoos]

I'm running Sumitomo T4 (sidewall rating 51psi) at 60psi. I'll fill them to 60psi, then let them drift down to 50psi before topping them off again. 65k miles on them so far with no unusual tire wear patterns.

[hummingbird]

basjoos, how long does the drift-down take? (my guess is anything upto 3 months...) What is the mechanism? Valve-stem leak?

[i_am_socket]

I have the Sumitomos as well and have been wondering if they were ok to push at or above sidewall (running them ~45 now). I'll have to bring them up to 50 and see how they do. (just a pain to fill them with my craptastic pump)

Sans screws or other debris in the tire, mine have held fairly steady pressure for the last month. They went down 10 pounds from end of September to beginning of December as a comparison.

[taco]

wow some of u guys run alot.

i run 40 in the white truck and 30 in the grey and 33-35 in the camry..

[Matt Herring]

I run 48 psi on my 51 psi max tires. They are at the end of their life and I have inspection coming up in April so I'm sure I'll have to pick up 4 new tires. Will be looking into LRR if I have to get the new ones. I drive a 4runner so I have to have a somewhat larger tire on the SUV.

[basjoos]

Originally Posted by hummingbird

basjoos, how long does the drift-down take? (my guess is anything upto 3 months...) What is the mechanism? Valve-stem leak?

I got the tires in the summer before last and it initially it took about about 4 months for the pressure to drift down as the oxygen constituent of the compressed air in the tire reacted with the rubber interior and the temps dropped as we went from summer into winter. Then as we went from winter to summer, the pressure pretty much held constant as the temps rose and I had to do another add in late summer. I last topped them off in Jan and haven't had to make any more adds since (other than the one that developed a leak from a nail and had to be patched. The tires are now 1-3/4 years old.

[aerohead]

Originally Posted by 1337

I've seen a few discussions about safe levels of overinflation and "hyperinflation."
(See
http://ecomodder.com/forum/showthrea...es-2522-5.html

http://ecomodder.com/forum/showthrea...es-2582-6.html

However, I have yet to see a thread about what ecomodders run in their tires. Please post how many PSI, what sort of tires, and how your inflation compares to the sidewall max.

In my Mazda, I run 48 PSI in the front tires (Michelin Harmony, rated at 44 PSI) and in the back, I run 42 PSI (some off-brand Hercules tires, with no rating listed).

I recently jumped to 48/42 from 45/38. Based on my last few tanks, I think it's likely that the extra few PSI helped my fuel economy.

I run recommended inflation pressures in the truck for regular driving (32/35 psi).For open-road high-speed interstate travel,I bump them up 3-psi,as per Toyota's recommendation.--------------- For the CRX,I run 44-psi,which is the max inflation pressure for those tires.Rides a little rougher but no issue for me.

[Compaq888]

Originally Posted by 1337

Compaq888 What do you drive?

A 1999 honda civic dx, stick of course

[1337]

Originally Posted by basjoos

I'm running Sumitomo T4 (sidewall rating 51psi) at 60psi. I'll fill them to 60psi, then let them drift down to 50psi before topping them off again. 65k miles on them so far with no unusual tire wear patterns.

I'm thinking of putting the Sumitomos on the rear 2 wheels of my Mazda. How much tread do you have left? Do you have an estimate on how long the tires will go?

[Funny]

Wow, I must be the highest percentage above sidewall max here. Cooper Lifeliner GLS Tires - 35 PSI sidewall max - Currently running at 55 PSI.
That is 157% over the rating for the tire, no blowouts or unusual tire wear yet, and I've had them on the Lemon for a year and a quarter. I have hit potholes that could swallow a car, and traveled 100+ miles at a time, still no issues. Maybe I'm just lucky .