What Psi Do You Have Your 305/55r20'a At?

[rb-86]

title says it all. I just got a set of terra grapplers in 305/55r20. The sidewall says like 60, i have them at 50 right now. But my pressure sensors think its too much because I get a warning on the dash to check all the corners. The light on the dash to say their low isn't on, the truck just tells me to check the pressure on the info screen. Just curious to see what people have them at.

[lsuguy]

title says it all. I just got a set of terra grapplers in 305/55r20. The sidewall says like 60, i have them at 50 right now. But my pressure sensors think its too much because I get a warning on the dash to check all the corners. The light on the dash to say their low isn't on, the truck just tells me to check the pressure on the info screen. Just curious to see what people have them at.

 

I have the same setup and it's been suggested to me to run 40 in the front and 35 in the rear. Matt is actually the one who told me that. I've been running all at about 37 actually and just had my tires rotated for first time. Wear seems to be looking good and no problems.

[Matt_]

yup...

35 in the back

40 in the front

 

 

edit: when i tow heavy loads i leave the front at 40 and bump the back up to 45-50. for an unloaded 1500 series truck, anything over 40 psi is really overkill in D and E rated tires... just remember to up the pressure for towing/hauling

[Zembonez]

My 275-55-20s are running at 36 psi. I would be running them at 32 but the damn TPMS kicks off a light. Absolutely no reason to run 50 psi in a tire on a half ton truck unless you are hauling really heavy loads.

[rb-86]

thats what i was thinking too. I'll drop them to around 40. thanks.

[MacA]

thats what i was thinking too. I'll drop them to around 40. thanks.

 

Mine stay between 38 - 40 psi,

[Savagecanuck1]

You can run them right up to max PSI on the sidewall for better fuel mileage.They may ride stiff but there will not be any harm done

[Matt_]

You can run them right up to max PSI on the sidewall for better fuel mileage.They may ride stiff but there will not be any harm done

 

Except for wearing the center of the tread faster. I wonder how much the savings in fuel mileage would be swallowed up by the reduced life of the tires....

 

The difference in fuel mileage between a properly inflated tire and an overly inflated tire is minimal IMO. Definitely not worth the increased harshness in ride quality and decreased tire life.... just my $.02

 

Edit: not to mention there are actually safety concerns with running your tires with too high of pressure. Reducing that surface area in an effort to "save on gas" also translates into "less road contact".... which equates to less traction, especially when braking.

[Zembonez]

I'd gladly give up tire life and fuel economy if the ride is nice and smooth. I can buy more gas and tires.