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Old 04-15-2016, 12:51 PM
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Airing down tires on 20 inch wheels

I posted about this in another thread, but it would be better to split this out into its own.

I'm curious about folks experiences with airing down their tires on 20 inch rims for offroading. I'm wondering how the low profile sidewalls react, and what pressures people have had success with. I was hoping to be able to get 20 inch AT tires, and not have to get 18 inch tires and wheels just for off-roading.

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Old 04-15-2016, 09:05 PM
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Re: Airing down tires on 20 inch wheels

I aired mine down for the beach...to about 20 lbs...with no issue. I don't know that I'd consider that for "hard surface" off road, however.
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Old 04-15-2016, 09:31 PM
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Re: Airing down tires on 20 inch wheels

That should light up your TPM like a Christmas tree.

I think I'd hesitate to do that on a hard surface. There isn't much sidewall height to begin with and others have said it's fairly easy to bend the 20 inch wheels just by hitting potholes on the street.
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Old 04-15-2016, 10:03 PM
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Re: Airing down tires on 20 inch wheels

I wouldn't call the tires on the 20" wheels "low profile"....or really even close to it. They have a pretty beefy sidewall. Atleast compared to what I'm used to.
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Old 04-15-2016, 10:08 PM
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Re: Airing down tires on 20 inch wheels

For offroad purposes, they're low profile. That's why they use 18's with the ORA packages.
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Old 04-16-2016, 09:31 AM
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Re: Airing down tires on 20 inch wheels

Quote:
Originally Posted by MDBones View Post
That should light up your TPM like a Christmas tree. .
Yea, it does...on mine, the light starts flashing at 29 lbs, likely because pressure dropping that much is probably a leak under normal circumstances.
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Old 04-16-2016, 09:35 AM
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Re: Airing down tires on 20 inch wheels

I remember once when we had a very significant drop in temps and along with that, tire pressure. LOL... all 4 tires were lit up on the TPM when I started the vehicle in the morning.
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Old 04-16-2016, 09:38 AM
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Re: Airing down tires on 20 inch wheels

Quote:
Originally Posted by ggowins View Post
I posted about this in another thread, but it would be better to split this out into its own.

I'm curious about folks experiences with airing down their tires on 20 inch rims for offroading. I'm wondering how the low profile sidewalls react, and what pressures people have had success with. I was hoping to be able to get 20 inch AT tires, and not have to get 18 inch tires and wheels just for off-roading.
are you running OE tires or oversized 275/55/20s?? bc that size has almost as much sidwall as the OE 18's.
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Old 04-16-2016, 09:41 AM
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Re: Airing down tires on 20 inch wheels

Quote:
Originally Posted by MDBones View Post
I think I'd hesitate to do that on a hard surface. There isn't much sidewall height to begin with and others have said it's fairly easy to bend the 20 inch wheels just by hitting potholes on the street.
Yeah, this is what concerns me. I'm afraid of bending the wheel at a speed of 20-25mpg on a forest road, or even just at crawl speed over some obstacle like a log or field of fist to bowling ball sized rocks. I tried searching for mentions of people who had done this, but nothing came up in my searches. Hence the hope someone could chime in with their experiences. Sand I'm not worried about, but harder surfaces give me pause.
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Old 04-16-2016, 09:42 AM
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Re: Airing down tires on 20 inch wheels

Quote:
Originally Posted by GrandCherokee3270 View Post
are you running OE tires or oversized 275/55/20s?? bc that size has almost as much sidwall as the OE 18's.
Have the OE Goodyear AS on there now. Was looking to move to 275/55/20 ATs once it is time to replace the factory shoes.
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Old 04-16-2016, 09:49 AM
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Re: Airing down tires on 20 inch wheels

yeah id be careful not all that much sidewall there to start with and airing down is going to make it worse. Never bent a rim in my life but have bent 2 of these 20s so far and that was at normal pressure there is just not a whole lot of tire there to protect them with these lower profile tires on these 20s
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Old 04-16-2016, 10:14 AM
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Re: Airing down tires on 20 inch wheels

Quote:
Originally Posted by ggowins View Post
Have the OE Goodyear AS on there now. Was looking to move to 275/55/20 ATs once it is time to replace the factory shoes.
I couldn't wait. I sold my OE tires on craigs list. If you have 20s and off road, I think 275/55s are pretty much a necessity. Sidewall is a good thing. I bought my 20s before I realized how much suspension travel a wk2 had and how much I like to take mine off road. Since then I've found what is basically the perfect off road wheel for a WK2: 17 x 7 with 40mm offset for only $75 each! It has made me consider buying a whole new set of wheels so I can air down a bit and bomb through the desert. Note these will only work with regular brakes. may only work with a V6 and not sure about vehicles with tow package but I don't have a tow package. a 275/70/17 tire should work great.

Alternative Steel Rim 17x7 5x127 X47127 | eBay
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