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  #13  
Old 04-19-2016, 03:31 PM
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Re: Airing down tires on 20 inch wheels

i typically run my 33x12.50-20s at 15-17psi in most cases while offroading.

you can see the rear squishin here a bit...

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Old 04-19-2016, 04:49 PM
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Re: Airing down tires on 20 inch wheels

I take my 20's down to 18-20 psi for offroading, either snow or sand, never had a problem, obviously if you then hit a road you have to go slower than in usual in order not to damage the wheel, best thing is to have a compressor handy to air up as soon as possible.
In my case my compressor comes always along as its part of the train horn, I installed a "T" so I can always pump air just by connectintg a hose.
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Old 04-19-2016, 04:58 PM
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Airing down tires on 20 inch wheels

On my 2014 when I took it to Silverton, CO I aired down to 20lbs on 20" wheels with the stock Forteras. It was mostly trails with tons of sharp rock. Punctured one tire, scratched 2 rims and cracked one rim. Never again
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Old 04-22-2016, 03:56 PM
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Re: Airing down tires on 20 inch wheels

Depending out what you are airing down for, I would be a little cautious. I'm sure on flat surfaces, like in sand, where all 4 tires will stay on the ground and share fairly equal loading on each tire (obviously they will never be perfectly equal) you could get away with airing down a bit more. However, off-road where ledges, rocks, step inclines/declines, etc. I would be a little more cautions with how much you wanted to air down. There isn't much rubber to squish running 20's. If you wanted to get a better advantage of "airing" down then I would go w/ 18's or even 17's.

That being said, I don't know how hard-core your wanting to get w/ your Grand Cherokee. I take my WK2 all over... but I'm not stupid either. There is a reason I have a RZR.
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Old 04-23-2016, 01:58 AM
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Re: Airing down tires on 20 inch wheels

Agree with others above, if you plan to off road and air down 20s are not the way to go. I comfortably air down to 15psi on my LT275/65/18s and the LT helps with the stiffer sidewallsImageUploadedByJeepGarage1461390801.884639.jpg


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Old 04-26-2016, 07:19 PM
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Re: Airing down tires on 20 inch wheels

Thanks for all of the input! Seems like trying anything more than sand with the stock all season tires is a bad idea. Next best plan is beefier all-terrain tires on the 20 inch rims, with the best option being 18 inch wheels (I have a Summit, so 17 inch wheels aren't an option) and tires.
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Old 04-26-2016, 11:08 PM
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Re: Airing down tires on 20 inch wheels

If you have the summit you can swap out the front air sensor links for custom ones (see different thread for instructions on how to make. Super easy) and raise the front up enough to level and get some meat on the 20's i put 275 55 20 nitto G2's and in hindsight could have went with the narrower 265 60 20's that come with even deeper tread and probably wouldnt have had to raise it any more. No rubbing with the current tires and outside of the raising via links the tires give me another inch or so ground clearance.
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