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Old 11-12-2008, 04:47 PM   #1
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Tire Question

Sorry if this subject has been asked before.

Just ordered a Rubicon for my wife. As in the past she wants me to put
some larger tires on (go figure!).

What is the max tire size I can go with and not have to do any mods
to the suspension. I was thinking 285 -70 -17's should fit.

Thanks,

Brian.

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Old 11-13-2008, 04:55 AM   #2
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Will you be installing those tires on the factory rims? If so they will work, but may have some slight, slight rubbing on the sway bar & lower control arm. One way to eliminate this is using quality wheel spacers..Other than that you could mount them on aftermarket rims with 4-4.5" back spacing...




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Old 11-13-2008, 05:07 AM   #3
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Quote:
Originally Posted by Hawkeye View Post
Sorry if this subject has been asked before.

Just ordered a Rubicon for my wife. As in the past she wants me to put
some larger tires on (go figure!).

What is the max tire size I can go with and not have to do any mods
to the suspension. I was thinking 285 -70 -17's should fit.

Thanks,

Brian.
They'll rub.
They'll fit with spacers unless you use the disco and they'll top-out at full stuff.
Wheel spacers and urethane spacers on the springs or a one inch body lift would work but is the ghetto method.
If you only go up to a 275 width you should be ok. Or shoot the wad and get a 2.5" lift and some new wheels with more backspacing.
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Old 11-13-2008, 09:11 AM   #4
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Thanks for the replies. The Jeep web site offers some optional rims. I'm not opposed to buying extra rims, what is the correct offset to avoid rubbing? The Jeep accessories
book sells 17 x 8.5 rims. They should be a direct replacement.

If I buy spacers, should I get 1/2"?

Thanks,

Brian.
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Old 11-13-2008, 10:02 AM   #5
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Like aldaman posted, you need 4.5" or so of backspacing to avoid rubbing the control arm and swaybar. Regardless, when you step up to the 33" tire you'll rub (and maybe forcefully remove) your fender at full stuff when you're disco'd on a Rubi --- you'll need to buy yourself an inch. If you never disco, you won't need to lift.
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Old 11-13-2008, 01:49 PM   #6
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Thanks Bill. The new tires would be 32.7" and I can not ever see her doing the
disconnect (if that's what disco means!) I used this calculater to compare sizes
and they don't seem too different.
http://www.miata.net/cgi-bin/tirescgi

Just enough to make her's a little different.

Brian.
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Old 11-13-2008, 02:20 PM   #7
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Here's a better calculator:
Tire Size Calculator - tire & wheel plus sizing

A 285 that's 32.7 and will never be disco'd should be fine with a set of spacers then. My tires are 32.6" but are only 265 width; I don't rub at full stuff.
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Old 11-13-2008, 03:44 PM   #8
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Thanks Bill, excellent size chart!
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Old 11-13-2008, 11:13 PM   #9
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Quote:
Originally Posted by Hilldweller View Post
Like aldaman posted, you need 4.5" or so of backspacing to avoid rubbing the control arm and swaybar. Regardless, when you step up to the 33" tire you'll rub (and maybe forcefully remove) your fender at full stuff when you're disco'd on a Rubi --- you'll need to buy yourself an inch. If you never disco, you won't need to lift.
....Went that route....Purchased aftermarket rims and mounted 285/75 tires on them with a 1" Body lift...Holding off on adding a suspension lift, until I regear and move up to 35s...











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Old 11-15-2008, 06:28 AM   #10
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Looks great!
Are the wheels soft 8's?
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Old 11-15-2008, 01:26 PM   #11
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Looks great!
Are the wheels soft 8's?
No, similar though...I believe the soft 8s are steel wheels....These are alloy wheels made by Pro Comp #8069s......Thanks...
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Old 11-16-2008, 09:47 AM   #12
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No, similar though...I believe the soft 8s are steel wheels....These are alloy wheels made by Pro Comp #8069s......Thanks...
Okay. Those are lighter.
Funny that nobody ever talks about the weight of the wheels and tires but contently we complain about fuel economy and poor handling.
Wheel and tire (unsprung) weight are very important when you consider the handling quirks of a live front axle.
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Old 11-17-2008, 07:40 PM   #13
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Quote:
Originally Posted by Hilldweller View Post
Okay. Those are lighter.
Funny that nobody ever talks about the weight of the wheels and tires but contently we complain about fuel economy and poor handling.
Wheel and tire (unsprung) weight are very important when you consider the handling quirks of a live front axle.
thats a great point. i have the stock X steel wheels i was just wondering what the weight differences are in alloy wheels and the steel ones. thanks
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Old 11-18-2008, 06:02 PM   #14
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thats a great point. i have the stock X steel wheels i was just wondering what the weight differences are in alloy wheels and the steel ones. thanks
Craigar soft 8 steels 16x8 37lbs each
Eagle alloys 16 x 8 24lbs each.

But tires
Goodyear wrangler SR-A 265/75/16 C load 39lbs, E load 47lbs
BFG T/A KO 265/75/16 C load 51lbs, E load 54lbs
Yokohama Geolander A/T-S 265/75/16 53 lbs
Mickey T MTZ 265/75/16 53lbs

lets move up in size.. With the Mickey T MTZs
285/75/16 56lbs
305/75/16 61lbs
315/75/16 67lbs
33x16s 79lbs

By the time you get to 33s the weight of the steel rim is insignificant.
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Old 11-19-2008, 10:18 AM   #15
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Every pound that you save in unsprung weight is like taking 10 pounds off payload. Add the dynamics of the live axles and you can make significant inroads to better performance (handling, comfort, & economy) with lighter wheels and tires. As long as you don't break a wheel or get a flat, of course...
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Old 11-19-2008, 04:42 PM   #16
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Originally Posted by Hilldweller View Post
Every pound that you save in unsprung weight is like taking 10 pounds off payload. Add the dynamics of the live axles and you can make significant inroads to better performance (handling, comfort, & economy) with lighter wheels and tires. As long as you don't break a wheel or get a flat, of course...
That is an exaggerated over simplification.

To make an appreciable difference the change has to be at least 10% of the total..

Total weight of 33s and steel rims would be 116lbs
total weight of 33s and alloy rims would be 103lbs a savings of 12% barely noticeable, if at. Over 33s any savings of weight from steel to alloy would be less than 10% the total, not enough to make any noticeable difference in handling.

Fact is there is no way to keep the handling when going to bigger heavier tires.
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Old 11-20-2008, 07:33 AM   #17
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Fact is there is no way to keep the handling when going to bigger heavier tires.
That's precisely my point.
Most people change tires merely for aesthetics. Which is
I'm just trying to shed some light onto what unsprung weight means; it does affect all aspects of street performance.
So make wheel & tire purchase based upon need, not which one you think is "cool".
I was able to shave 12 pounds at every corner of my Mini by switching rubber and wheels. It went from wow-quick to holycrap-quick. Neat.
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Old 11-21-2008, 08:13 PM   #18
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Nice rims! Pretty fly!
The black on black is tasteful.

C.
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Old 12-04-2008, 08:37 PM   #19
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I think I've made a decision. After a few trips to the dealership and
my local tire dealer.

I shall purshase the optional chrome 18" rims from the dealer and then
have 275R6518 Goodyear MaxTraction M/T's put on. My wife only wants
it to look good. The bad news is that they will give me nothing for the
stock Rubicon tires and rims. So, I guess I'll try to sell them privately. It
would make a nice upgrade to someone with regular Wrangler rims.

BTW, dealer called. The body was painted today and assembly should
start tomorrow. Timing is good. Her birthday is December 31.

Anyone else running the chrome rims? (6 spoke)
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Old 12-05-2008, 07:51 AM   #20
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Quote:
Originally Posted by Hawkeye View Post
I think I've made a decision. After a few trips to the dealership and
my local tire dealer.

I shall purshase the optional chrome 18" rims from the dealer and then
have 275R6518 Goodyear MaxTraction M/T's put on. My wife only wants
it to look good. The bad news is that they will give me nothing for the
stock Rubicon tires and rims. So, I guess I'll try to sell them privately. It
would make a nice upgrade to someone with regular Wrangler rims.

BTW, dealer called. The body was painted today and assembly should
start tomorrow. Timing is good. Her birthday is December 31.

Anyone else running the chrome rims? (6 spoke)
Hells bells; don't get the 18" wheels! The replacement rubber is more expensive and doesn't work as well... The 18's were introduced into the Jeep DNA by Satan himself...
If you really want 18's, I'll trade you my Sahara wheels for your Rubi wheels. You can find people all over the country desperate to sell their stock Sahara 18's!!!

If you want a much better wheel that's easy to fit with rubber, look at AEV and buy their 16's; you can put a D-rated 285/75-16 General on them for about $150 or less per. Best wheels and decent AT.
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Old 12-05-2008, 10:52 AM   #21
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Thanks for the heads up, but what is wrong with 18's? I am not concerned
with the cost of replacement rubber. They will last at least 5 years. Her
current rubber is 6 years old and still lots of tread and no cracking.

I just want to fill the wheel well and give the Jeep a more aggressive look. My
wife will not off road it. I thought the chrome would look sharp with the
Sunburst Orange ( the color she wants ).
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Old 12-05-2008, 11:38 AM   #22
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Thanks for the heads up, but what is wrong with 18's? I am not concerned
with the cost of replacement rubber. They will last at least 5 years. Her
current rubber is 6 years old and still lots of tread and no cracking.

I just want to fill the wheel well and give the Jeep a more aggressive look. My
wife will not off road it. I thought the chrome would look sharp with the
Sunburst Orange ( the color she wants ).
You got her a Rubicon and she's not going to offroad it?
The Sahara or a built X would've saved you lots of scratch then....
The problem with 18's is all in offroad performance, really. If it honestly is only going to stay on pavement, the 18's will perform better for her. It's the sidewalls.

I've just never personally built a vehicle up in a way that favored aesthetics over function. I get physically sick when I see lowered pick-up trucks....

I like the look of black wheels on the orange paint, btw. They'd also go with the black top and fenders.
ATX makes a couple that are lighter than stock and have a menacing look to them.

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Old 12-05-2008, 01:55 PM   #23
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Thanks Bill. Your info is appreciated. Her current 02 has been off road twice, that was
to pull my son and his his friends out of the mud. What I'll do is give it to her
with the chrome on (it's a surprise birth day present) and I'll keep the original rims
and tires in case we want to do a trail ride. That should make sense.
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Old 12-05-2008, 03:11 PM   #24
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Brand new Rubi wheels should fetch you a good $600 or so.
And a set of very decent alloy 18's would run $1000 or less....
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Old 12-06-2008, 07:56 AM   #25
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Thanks for the reply. Got some thinking to do.
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Old 12-29-2008, 04:31 PM   #26
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The Jeep is in, and I've hidden it till her birth day. I went with the chrome 18" from
the dealer (trade price) and 275 65 18 - Goodyear MT's. I think it looks awesome!

I'll snap a few photos when I can. Although I think she may want a little wider tire!

Brian.
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Old 12-30-2008, 07:58 AM   #27
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The Jeep is in, and I've hidden it till her birth day. I went with the chrome 18" from
the dealer (trade price) and 275 65 18 - Goodyear MT's. I think it looks awesome!

I'll snap a few photos when I can. Although I think she may want a little wider tire!

Brian.
If you go wider, you'll need spacers.
Try the spacers first and you might not even want wider...
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Old 12-30-2008, 11:06 AM   #28
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Here are a couple shots. It is stored in an underground parking lot till her
birthday!

Thanks for the tip on the spacers, it would make the tires look wider. How
wide a spacer should I get? 1/2"??

Thanks, Brian.



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Old 12-30-2008, 11:25 AM   #29
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And one of the wheels, not a good image though.

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Old 12-30-2008, 11:57 AM   #30
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I've seen 1.25 to 1.5" --- Spidertrax, Teraflex, & Rugged Ridge. I wouldn't use a no-name...

EDIT --- check the backspacing on those wheels though. I'm not familiar with them. If they're 5" or less, you might not need spacers for a 285 series.

Looks sharp, btw.

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