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Unread 07-21-2010, 09:05 AM   #1
camo_deerslayer
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2008 Rubicon tire question's

Okay, I've "searched" for this information and can't seem to find a common answer...

1. What size are my 255/70-17's that came on my Rubi? (31", 32")

2. Anybody have pics of a Rubicon with 33" tires and a 2.5" budget lift?

If my tires are 31" now, 33's might make me happy.... I really can't afford to re-gear to put 35's on, but don't want to "poor-boy" it either since this is also a daily driver.

Oh, my Jeep has the 6-speed manual transmission....

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Unread 07-21-2010, 09:22 AM   #2
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255/70-17 comes out to 31.1" ..I thought they came with 32's? BTW 35's with the 6 speed and 4.10's isn't bad...I'd like to regear at some point but it's not killing me or anything. I just checked and my Rubi tires were 255/75R17 those come out to 32.1"
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Unread 07-21-2010, 09:42 AM   #3
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Quote:
Originally Posted by boostedboxer View Post
255/70-17 comes out to 31.1" ..I thought they came with 32's? BTW 35's with the 6 speed and 4.10's isn't bad...I'd like to regear at some point but it's not killing me or anything. I just checked and my Rubi tires were 255/75R17 those come out to 32.1"
for BFG km1 (stock rubicon) and km2, they seem to always measure almost an inch lower then they are marketed as. so, jeep/bfg call the stock rubicon tires 32s, but mine way over aired never measured more then 31 1/4. the new 35s, way over aired, measure in at 34 1/8.

what was funny, when i put the superchips in the first time it the stock settings read the tire size as 31.25, even though it was marketed as a 32.
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Unread 07-21-2010, 10:55 AM   #4
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The Rubiís come with 32ís.
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Unread 07-21-2010, 11:21 AM   #5
camo_deerslayer
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Okay, I may have remembered the size wrong... maybe there are 75's not 70's...

I want bigger tires and a small lift, but would like to keep stock handling and not open up "pandora's box" in regards to future mods needed...

If the 35's won't kill my power too bad with the 6-speed manual transmission and the 4.1 gears (I THINK that is what my Rubicon came with) that may be the way to go.. I can't imagine I would notice much of a visual difference going from 32's to 33's.... maybe I'm wrong.

Does the Superchips allow for re-calibrating the speedo and such?
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Unread 07-21-2010, 11:43 AM   #6
skivviss
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Quote:
Originally Posted by camo_deerslayer View Post
Okay, I may have remembered the size wrong... maybe there are 75's not 70's...

I want bigger tires and a small lift, but would like to keep stock handling and not open up "pandora's box" in regards to future mods needed...

If the 35's won't kill my power too bad with the 6-speed manual transmission and the 4.1 gears (I THINK that is what my Rubicon came with) that may be the way to go.. I can't imagine I would notice much of a visual difference going from 32's to 33's.... maybe I'm wrong.

Does the Superchips allow for re-calibrating the speedo and such?
a smaller wheel (16s vs 17s) and going from 32 tire to 33 can actually show up nicely. the 16s help give the rubber a meatier look, mixed with an aggressive tread you can accomplish a nice 'makeover' that way. and not really move into 35s where gears bigger lifts will be considerations as well.
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Unread 07-21-2010, 11:46 AM   #7
JIMBOX
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The Rubi's come with BFG 255/75x17 ('08) and they are 31" ++installed

My Rubi Has Hankook Dynapros MT--LT295/75x16 and they are 33.2" at 30psi

The lift is RC 2.5" (steel spacers) and shocks are RS9000XL (adj)





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Unread 07-21-2010, 12:48 PM   #8
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Try this site out for comparisons:

Wheel / tire size calculator / comparer - RIMSnTIRES.com
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Unread 07-21-2010, 01:17 PM   #9
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With a 6 speed rubicon you can go with 35s without a regear. On road you will be fine, I have 3.21 with 34s and have no problem and off road, you will be fine especially with rubi transfer case. I wouldnt worry about gearing and 35s. 4.10s are fine. go with the 35s or split the differnce like i did with 34s. go to my build page if you want to see pics of 34s.
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Unread 07-21-2010, 01:25 PM   #10
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Quote:
Originally Posted by 1398653 View Post
With a 6 speed rubicon you can go with 35s without a regear. On road you will be fine, I have 3.21 with 34s and have no problem and off road, you will be fine especially with rubi transfer case. I wouldnt worry about gearing and 35s. 4.10s are fine. go with the 35s or split the differnce like i did with 34s. go to my build page if you want to see pics of 34s.
Yes and No IMO - the tcase only affects performance in LO range - no diff between an X or Rubi in HI range on the highway. And with a 6spd and 4.10 axle performance will be sluggish in 6th gear esp if you live where some us do in mountains above 6,000 ft. Majority on this forum would agree to this stmt - but, as with any forum, many users = many opinions.
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Unread 07-21-2010, 01:28 PM   #11
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I have 3.21s and 34s and the on road performance doesnt bother me at all. I lost 6th gear. As far asI am concerned 6 gears are for race cars anyway. Off road is where the gearing is pissing me off. If I never wheeled I wouldnt bother regearing but since I wheel alot regear is in the plans. I also live in a very hilly area right north or allegany national forest on PA NY border. I really think 4.10s with 35s and 6 speed will be fine but as was already said, many people feel different about this.
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Unread 07-21-2010, 01:31 PM   #12
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I've found that Tirerack.com has the best information on tires. If you search by size and go to the specs, it gives you the information for each specific tire.
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Unread 07-21-2010, 01:33 PM   #13
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I have Rubicon Unlimited with the 6-spd and I only went with 33s, because I tow a small jet boat(2000lbs trailer and all). Man am I glad I stayed with 33s for towing purposes. When we upgrade to a 21 foot open bow boat next year, I can only imagine how bad it will be(Probably will be real close to the 3500lb limit). I am not trying to sway you, believe me I wish I could of got 35s however I just couldn't justify regearing with a new vehicle. 35s will happen when it hits 100k and is not a DD. As side note. My highways are not mountains but they are some rolling steep hills, which does affects my experience. I also have the Flashpaq and can't really atest for the any real power increase with a manual trans. Now for some with an auto, this may be different.
Just my two cents.
Oh and yes I have to agree as it was previously stated, you can tell when you put 33s on. I installed the 33s on my jk by myself and have a picture where you can easily see the jk leaning to one side. Sorry don't have the picture here at work.
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Unread 07-21-2010, 02:05 PM   #14
camo_deerslayer
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Thanks for the pics JIMBOX!!!

If I can get 2" of lift and tires... that'll be GREAT!!
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Unread 07-21-2010, 02:11 PM   #15
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Thanx camo, the RC 2.5 Basic is pretty cheap, with stock shock extenders too


Quote:
Originally Posted by camo_deerslayer View Post
Thanks for the pics JIMBOX!!!

If I can get 2" of lift and tires... that'll be GREAT!!
Be careful of the RC combo kits though, their shocks aren't the best, thats why I just got the steel spacers-

Mine was $99 bucks last year, checkout "Teraflex" deals, they're pretty good

Good luck

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