Airing down without losing a bead
Sep 9, 2007 | 11:56 PM
#21
Contributing Member
Joined: Jun 2007
Posts: 4,222
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From: Lake County, CA/Sacramento
10-15 should be fine for most anything. If in doubt, keep it a little higher than that. I've put tires on rims before, and taken them off. It takes quite a bit of force to get a tire off bead. Just remember to take her easy when you got the tires aired down. It helps to have a spare just in case...
Sep 10, 2007 | 04:59 PM
#22
Registered User
Joined: Jan 2007
Posts: 243
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From: Minot, ND
So I went out today. I aired them down to 12 psi. I some pretty gruesome (well, to me anyway) lines up a half-sand covered hill, and never lost a bead, although a Cherokee with 33's and lockers front and rear made it look too easy. I had to take the lines usually a few times to make it, but made it (no lockers!). I'm guessing I could have went down to 10 psi, even possibly 8, but as this was my first time airing down my tires, I did not want to risk it. But the aired down tires made a HUGE difference in grip, especially off-road.
Sep 10, 2007 | 05:13 PM
#23
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Joined: Feb 2005
Posts: 636
Likes: 0
From: Montrose, CO
Keep in mind that airing down also allows the tire to spin on the wheel. This causes severe misalignment of the balancing weights and will result in rapid tire wear once you air up and hit the pavement.
Most people are unaware of this having occurred but it is easy enough to test on your rig....just chalk the tire to the rim and go wheel. You will find that the chalk line has moved significantly from the mark on the wheel.
You then have 2 choices:
1. Re-balance your tires after every wheeling trip BEFORE you put any highway or pavement miles on the tires or...
2. Pull off those static balancing weights and install the appropriate amount of a product such as Equal tire balancing beads. They dynamically balance the tire at all speeds and safe operating pressures. You will also need to install filtering valve stems to filter the media from the air as you air down.
Most people are unaware of this having occurred but it is easy enough to test on your rig....just chalk the tire to the rim and go wheel. You will find that the chalk line has moved significantly from the mark on the wheel.
You then have 2 choices:
1. Re-balance your tires after every wheeling trip BEFORE you put any highway or pavement miles on the tires or...
2. Pull off those static balancing weights and install the appropriate amount of a product such as Equal tire balancing beads. They dynamically balance the tire at all speeds and safe operating pressures. You will also need to install filtering valve stems to filter the media from the air as you air down.
Sep 10, 2007 | 05:19 PM
#24
Banned
Joined: Feb 2005
Posts: 636
Likes: 0
From: Montrose, CO
something that no one has mentioned, or i missed it, is for those who DD thier rigs, popping a bead isnt the only thing to be concerned about. When you lower your tire pressure you also increase the risk of the tire spinning on the rim, thus changing your wheel balance. Its always a good idea for those who DD thier rigs to use chalk and mark a line that crosses rim and tire to see if you've spun it if you air down real low.
back to topic, id say around 15 safely for your combo... I run between 7 and 15 with 33x12.50 on an 8" rim, and could probably go less if needed. But, like many have said, it will depend on setup, driver, and conditions.
back to topic, id say around 15 safely for your combo... I run between 7 and 15 with 33x12.50 on an 8" rim, and could probably go less if needed. But, like many have said, it will depend on setup, driver, and conditions.
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