s1njin

Does anybody have a HDPP optioned truck w/ 18" tires? I'm wondering what the tire pressures are listed at on the door jamb?

I'm considering bumping up to LT tires on my next go around, however I'm having a terrible time figuring out what the proper pressure would be. My door jamb is calling for 35psi, but that's for 'P' rated tires.

Also, how do I know if my 18" Ford sport rims can handle the extra pressure?

Tire Rack is telling me 50 pounds in a DEFENDER LTX M/S - SIZE: LT275/65R18 will handle 5k pounds, which is way more then my 3800 RAWR, however I can't find it WRITTEN down anywhere !

Thoughts, advice?

mhamershock

48 PSI for full load capability on the C rated Goodyears. I run 42F/44R when I'm not towing.

Mike

s1njin

The DEFENDER LTX M/S - SIZE: LT275/65R18 come in 'P' and 'E' flavors. I'm not sure the pressure you have for your 'C' would be different if the tire was a 'E', would it?

mhamershock

Yeah - E's are usually good up to 80 PSI on the sidewall. An E is a stiffer tire, heavier, and rides worse than a C. I've run Es before too but never at 80. I usually stop at 65 PSI or so towing, and 50 empty.

The bigger issue is the wheel. Is it rated for 60 or 80 PSI too? And what is its weight rating? The HDPP 17&18" rim is designed to support more weight than any of the other 150 rims (2275 lbs). Not sure what PSI it is rated at - can't find that spec anywhere. All the other rims max at 2000 lbs.

M

s1njin

Which Goodyears are you running, out of interest?

mhamershock

Stock that came with the truck. Seems pretty good so far.

https://www.tirerack.com/tires/tires...re+with+Kevlar

Mike

s1njin

So Ford outfitted a HDPP truck w/ Load 'C' tires? Interesting. Your's is definitely a HDPP truck right? One of the few? What year? 18's or 17's?

mhamershock

2018 Lariat SCREW. I special ordered it specifically for the HDPP package. I might even stay with C or D rated for the next set of tires. E rated ride pretty stiff.

Mike