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Old 01-12-2014, 08:04 PM
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Best tire PSI for 20's?

The weather here in MD is wonky, to say the least. A week ago, we were 6 degrees above. Today, nearly 60. Tire pressures are fluctuating as much as the temperature (I'm an avid sport motorcyclist, so I tend to be extremely in-tune with my tires). My question is this - what have people found to be the best tire pressure for the 20's with stock tires?

On my Ram 2500 (10 ply 17" tires), I run 80psi (cold). Even treadwear, excellent tread life, outstanding fuel economy (for a big honkin' fullsize diesel pickup).

My YJ Wrangler (31x10.50-15) and XJ Cherokee (265-75/15...I think) are happiest at 32-35 - any more and they wear down the center, any less and the tread gets serrated and the handling gets even worse lol.

I just aired up the WK2's set to 40. They were all at 35(ish) - my first physical check (outside of the EVIC), had it 2 weeks, has about 2500 miles on it now.

I'm hoping for the best fuel economy I can get, without wonky tread wear. Does anyone have any ideas or experience? The tire sidewall says max PSI of anyone running them at 50? Any treadwear issues? I got the diesel because I wanted the best MPG I can get - 5psi drop on my Ram loses me about 2mpg, so if adding another 10psi to the WK2 can net me some MPG without hurting treadwear patterns....well hell, air's free!

'14 WK2 Summit EcoDiesel
'01 Ram 2500 QCLB Cummins 6spd 4x4, '92 XJ 4.0/auto, 91 Daytona CS/AGS (original owner), 89 Shelby CSX-VNT #135, 87 Shelby CSX #133, 86 Shelby GLHS #499...and some Buell motorcycles for nice weather.
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Old 01-12-2014, 08:18 PM
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Re: Best tire PSI for 20's?

It's hard for us in NC lately to get a consistent inflation pressure, as we've also been getting the wild swings in temp lately. As you know, every 10 degree shift in ambient temp changes tire pressures by about 1 PSI.

I hate to admit it, but I've been going with the suggested pressures in the door jamb, as I don't want to piss off the TPMS. LOL

I used to be more active in trying to dial in the best pressures, but I still do "read" the tires by feeling the edges, and watching for crazy wear patterns.

Also, I tend to rotate at least every 5K miles to get the most out of my tires.
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