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Unread 11-22-2013, 11:28 AM   #16
biffgnar
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Originally Posted by wilson1010 View Post
I can see that. The wider the tire the more likely to gain traction on a part of the terrain.
Exactly!

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Unread 11-22-2013, 12:24 PM   #17
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Originally Posted by wilson1010 View Post
The contact patch of a 12.5 tire and a 10.5 tire at the same internal psi is exactly the same size. Just a little different shape. One is a little wider, one a little longer. And, there are fans of both shapes. It really depends on the terrain. In mud, some guys say that a wider tire is pushing more mud in front of the tire. I don't have an opinion on that. Just saying. But, on rocks, I doubt it makes any noticeable difference.


LMFAO, Ok.
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Unread 11-22-2013, 02:07 PM   #18
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It all depends, take a look at this.


Back in 79 I drove Citroen 2 CVs in pretty nasty fields in France with skinny tires, and it was freaking awsome where you could go with these.






On my JK I'm running 245/75R16 MT and 225/75R16 for my winter tires.

Understood that we all have different needs, but up to now, they have been fine for me. Myself for most of the situations (summer and winter), I need to dig to get traction. And aired down, the 245/75R16 MT have been fine in mud and sand also.
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Unread 11-22-2013, 06:04 PM   #19
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Originally Posted by Michel347 View Post
It all depends, take a look at this.

http://www.youtube.com/watch?v=nq2jY1trxqg
That is just amazing.
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Unread 11-23-2013, 05:52 AM   #20
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Skinny's ;-)

Skinny tires:

I was thinking of changing from 285 16 wheels to 15 aluminum wheels and going to the much lighter setup of:
33-10.50-15

Will save near 10 lbs per, rotating mass. Should save brakes and fuel.

Your thoughts?
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Unread 11-24-2013, 11:30 AM   #21
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Originally Posted by nickair544 View Post
Skinny tires:

I was thinking of changing from 285 16 wheels to 15 aluminum wheels and going to the much lighter setup of:
33-10.50-15

Will save near 10 lbs per, rotating mass. Should save brakes and fuel.

Your thoughts?
The reasoning for my question was not to save gas or the braking system, but with that being said I think you have a great question. I believe on the road you would, without a doubt save gas. With a 33X12.5 you have 4 feet of tire on the ground, let alone the windage pushing them at highway speeds vs 33X9.5, you would have only 3' 10" in contact with the pavement, which is almost 1 tire less in contact with the ground. I don't really see weight as an issue in a jeep because jeeps aren't fast, conferrable or aerodynamic, but yes the weight would make a difference with what you have named. I can't respond to the rotation of weight vs hp, gets way into physics. My question was simply because we in America run very over sized tires on Jeeps. My thinking on the subject is that a skinnier tire would truly perform better all around, both on and off road. What I mean by the wording "perform" is it would take less hp on and off road. And in most cases running the trails better unless your somewhere where you require more ground contact for traction, like rock crawling. But in rock crawling you have skinny spots you have to squeeze through between rocks sometimes... On the upside, Girls love big tires!
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Unread 11-24-2013, 01:35 PM   #22
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At the same psi and the same vehicle weight, every tire, regardless of size, puts the same area on the pavement. I have no opinion as to whether a wide tire or a narrow tire is better for gas mileage, but the contact area is the same. Just a different shape.
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Unread 11-24-2013, 11:42 PM   #23
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Originally Posted by wilson1010 View Post
At the same psi and the same vehicle weight, every tire, regardless of size, puts the same area on the pavement. I have no opinion as to whether a wide tire or a narrow tire is better for gas mileage, but the contact area is the same. Just a different shape.
Please explain how that is possible.
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Unread 11-25-2013, 06:59 AM   #24
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Originally Posted by AntiPrius View Post
Please explain how that is possible.
Its about physics.

The contact area of the tire equals the weight of the car divided by the internal pressure of the tire. More weight, more area on the ground. Less pressure, more area on the ground. And, vice versa. The shape of the tire means nada. A spherical tire (like a rubber ball) would give the same result.

A 3200 pound rig with 32 psi in the tires puts 100 square inches total to the ground. 25 square inches per tire. So, a 3200 pound rig with 16 psi in the tires puts 200 square inches of tire area on the ground. 50 square inches per tire. If the tire is 12.50 wide then the patch is 12.5" by 4". If the tire is 10 inches wide, then the patch is 10" by 5" and, so on.

The only thing hold the rims off the ground is the air in the tire. Each square inch of tire on the ground supports a certain amount of the weight of the car. If there is 32 psi in the tire, there is 32 psi on the ground. the lower the psi the more the tire spreads out to put more area of the tire at the lower psi.
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Unread 11-25-2013, 05:26 PM   #25
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Originally Posted by 222Doc View Post
That sounds like the pitch for the new health care. Don't matter what you NEED. Take what we force on you to buy.

That's just the way it is. There isn't enough of a selection to really be concerned with the width. There are very few tires that offer a difference in width to make the width a factor.


Your not going to notice a 1" difference between 1 tire and another tire.
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Unread 11-27-2013, 04:25 PM   #26
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Thanks guys. This helped me decide to try a set of 285-75-16s .

Now I need to check if my stock Rubicon wheels will work 285-75-16s?

I do have a bds 2 inch lift.

Thoughts?
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Unread 11-27-2013, 04:58 PM   #27
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That's a 33" by 11" tire and if I was willing to go out on a limb, I'd say they will work with the two inch lift.

Of course, the wheels are ok. No problem there, but do they fit under the fenders?

My 2003 Rubi has a 2" lift also and with 245/75/16's it looks like you could camp under there. But I think someone who actually has the tire on a 2" lift should speak up before you plunk down the money.
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Unread 11-27-2013, 05:34 PM   #28
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If BDS is still making quality suspensions, Then your 2" should be closer to 3", My old BDS 3" settled a tad under 4". Only thing you might want to check is the steering stops.
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Unread 11-28-2013, 11:30 PM   #29
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I prefer 9.5" wide for all purpose use on and off road on a daily driver. The 9.5 are very excellent on Winter roads. If aired down they are OK on sand. If not aired down, they sink to much on sand. My favorite sizes of 9.5" wide tires are 30 x 9.5 R15 and 245/75R16 (31 x 9.5 R16) load C.

For a list of 30 x 9.5 R15 tires see this thread: http://www.jeepforum.com/forum/f15/l...-zj-tj-1523888

Here is a list of 245/75R16 load C tires: Cooper AT3, Mastercraft AXT, Hercules AT2, and Duratrac. For more info about those tires see this thread: http://www.jeepforum.com/forum/f15/n...e-one-1527835/

---

I prefer 10.5" wide for all purpose use on and off road on a daily driver. The 10.5 are good on Winter roads. They are OK on sand if not aired down, but when aired down they are good on sand, IME. My favorite sizes of 10.5" wide tires are 31 x 10.5 R15 and 265/75R16 load C

Here is a list of 265/75R16 load C tires: Cooper AT3, Mastercraft AXT, Hercules AT2, Duratrac, and Mastercraft CT. For more info about those tires see this thread: http://www.jeepforum.com/forum/f15/n...e-one-1527835/

For those who like 33 x 10.5 R15 tires, have a look at BFG AT and Toyo MT. If you get Toyo MT, I suggest having the tire store add more sipes to center treads to increase Winter traction.

---

My favorite width for all purpose use is 10" wide tires aka 255. The General Grabber AT2 30 x 9.5 R15 is IRL a 10" wide tire. Duratrac 245/75R16 (load C) is IRL a 10" wide tire.

Perhaps you can find more 10" wide aka 255mm wide tires in load C.

I think load C is the best for a 1/4 ton SUV (like a Jeep).
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Unread 11-29-2013, 12:30 AM   #30
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P.S. - Narrow tires are lighter; have less rolling resistance; hydroplane less on wet highway; less strain on wheel bearings, steering, suspension, drivetrain; better gas mileage, acceration, and braking.

Narrower tires are also much easier and cheaper to fit and clear.

---

The only thing that would make me want a wide tire is if I were a dedicated rock crawler. Even then, I'd be looking for an 11" wide tire, or at most an 11.5" wide (aka 285).
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