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Old 05-31-2011, 11:33 AM
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Tire pressure

I have a new 2011 sportsman xp with the AT 489 II tires. The tire says max pressure is 17 pounds but what do most people run on them? Less then the max? I guess a better question is how little can you run without worrying about break the bead?

Mik
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Old 05-31-2011, 11:45 AM
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Quote:
Originally Posted by Mik View Post
I have a new 2011 sportsman xp with the AT 489 II tires. The tire says max pressure is 17 pounds but what do most people run on them? Less then the max? I guess a better question is how little can you run without worrying about break the bead?

Mik
Manual saids 5 PSI for all tires I think.
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Old 05-31-2011, 11:53 AM
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Yeah, I think 5-7 is pretty normal for all 4.

The max psi is just when installing the tire and trying to seat the bead on the rim. Not anywhere close to the psi you actually want to run at


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Old 05-31-2011, 12:48 PM
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Agreed, mine came with the 498's also and I ran them at 6 psi.

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Old 05-31-2011, 02:37 PM
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Quote:
Originally Posted by Mik View Post
I have a new 2011 sportsman xp with the AT 489 II tires. The tire says max pressure is 17 pounds but what do most people run on them? Less then the max? I guess a better question is how little can you run without worrying about break the bead?

Mik
My dealer claims I should run 10 lbs and a little more if riding rocky areas. I asked him twice about this and he was adamant about it.
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Old 05-31-2011, 02:55 PM
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Tire pressure, correct tire pressure is based on what your riding on, how you ride and the weight the machine is carrying. There for, its near impossible to give you an accurate "number".
Having said this, 17# of air is way too much and as stated is just for seating a bead.

I suggest, something less than 10 to as low as 4# depending on terrain.

Less air gives you a bigger footprint, but doesn't allow for as much speed. It will also allow for side wall pinch and higher possibility for "popping" a bead. Riding at higher speeds with extremely low pressure can cause unsafe handling as well. Tire wear/ the tires life span at these lo pressure will be more rapid/shorter too.

Too much air, gives a smaller footprint, smaller means the tire is not able to "envelop" the terrain. Causes excessive throttle to try to compensate causing more ground disturbance. This is where the TREAD LIGHTLY credo comes in. Personally, I like: "Slow as you can, fast as you have to." In jeeps, tire pressure can be the difference between concurring a obstacle or not conquered it. Higher pressure will cause wear in the center of the tire. (Remember the smaller footprint)

Long story short, get a small compressor and try a couple different pressures and see for yourself the difference. Pick a number and go... Your best "starting n number" will be a riding buddy riding the same terrain that rides simularly to you and is on a simular machine.
If your a bigger guy start higher, if your a string bean lower. More stuff in the ranks, add some air, savvy?

CW
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Old 05-31-2011, 03:22 PM
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I run around 5psi when i have my 489's on...remeber this the more air you run the less tire will hit the ground...so, i'd say 5 to 7 psi....there should be a sticker on your rear wheel fender thats has it...Muddie49
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Old 06-01-2011, 12:22 AM
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I agree with most others...4-7 depending on terrain and your weight. Make sure they are all the same (within 1/4 pound) or the bike will pull to one side. You should have received a low pressure gauge with the quad. If you ride more aggressively, you will need to use more air to prevent breaking the bead. A more moderate rider can run less air and enjoy a smoother ride. Longshot's information above was very good. Enjoy your new quad!
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Old 06-01-2011, 04:26 AM
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I run 2-3 psi in the winter if I have the tires on and 4-6 psi in the warm months depending on conditions.
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Old 06-01-2011, 07:36 AM
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Quote:
Originally Posted by Fishy View Post
I run 2-3 psi in the winter if I have the tires on and 4-6 psi in the warm months depending on conditions.
Fishy...I also run 2 pound of air on my 01 in the winter but that's because my old Gators have become so hard. When I run with tire pressure that low, I really need to keep an eye on them because it's easy to go from 2 pounds to 0 pounds. I didn't mention this earlier because I don't want to complicate the issue for a new rider. I'm due for new tires on the 01, and if I can find someone getting rid of lightly used 12" stockers, that will be good enough for what I use that quad for. Have a good day!
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Last edited by Dbez1; 06-01-2011 at 07:50 AM.
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