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Old 08-10-2012, 01:30 AM   #1
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No lift, 305/60R18 will they rub or ...........

I am going to switch the tires on my stock wheels (18" x 7.5"). My Wrangler is a 2012 Sahara 4-Dr.(3.6L Penastar, 3.73 gear ratio, CAI and TB spacer). The tires I have from the factory are 255/70R18 (32" x 10" R18) Dueler A/T Tires. The main reasons for the switch are looks and snow (mine is the 4-Dr in the first picture).

I have no plans on a lift. I will not be doing any rock crawling or going up or down anything steep. The biggest obstacles I will have will be pot-wholes and street curbs. I will only be driving over dirt, sand, snow and pavement.

I googled and found some pictures of a 2008 Sahara 2-Dr with the same tires size I am getting and stock 18" wheels and no lift(the 4 pictures of the 2-Dr below). The truck is all stock except for 305/60R18 M/T (32.6" x 12.2" R18) tires and 1.375" wheel spacers.

I am trying to measure the ups and downs.

Will the tires rub when turning or hit when going over those pot-wholes and street curbs?

Will there be any handling changes (steering,braking, acceleration)?

Will the gas mileage be affected?

Will there be a lot more tire noise on the highway?

Is it safe to buy 4 and use my old tire as an emergency spare or do I have to buy all 5?

I don't think I will have to change to speedo gear ( think thats for when the tires are much taller).

Anything else?
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IBee- 2012 Sahara Unlimited 4-Dr Silver, Black Hard/Soft top, Dark Sadle Leather Seats ,18" 7 Spoke polished 70th Anniv.Wheels, 32" Dueler A/T Tires, Black on Black "Jeep" anti-theft tire cover, mud flaps, Black grill inserts, Black hood scoop, Black door handle/side marker/tail light guards, Black gas cap door, aFe air intake & TB Spacer.
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Old 08-10-2012, 01:48 AM   #2
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No lift, 305/60R18 will they rub or ......

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IBee- 2012 Sahara Unlimited 4-Dr Silver, Black Hard/Soft top, Dark Sadle Leather Seats ,18" 7 Spoke polished 70th Anniv.Wheels, 32" Dueler A/T Tires, Black on Black "Jeep" anti-theft tire cover, mud flaps, Black grill inserts, Black hood scoop, Black door handle/side marker/tail light guards, Black gas cap door, aFe air intake & TB Spacer.
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Old 08-10-2012, 06:46 AM   #3
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Quote:
Originally Posted by IBee View Post
I am trying to measure the ups and downs.

Will the tires rub when turning or hit when going over those pot-wholes and street curbs?
They will definitely rub without wheel spacers, unless you get wheels with less backspacing. The slight difference in height will not be an issue.

Quote:
Originally Posted by IBee View Post
Will there be any handling changes (steering,braking, acceleration)?
Absolutely.

Quote:
Originally Posted by IBee View Post
Will the gas mileage be affected?
Yes. There will be more rolling resistance because of the added width.

Quote:
Originally Posted by IBee View Post
Will there be a lot more tire noise on the highway?
Depends on the tire, but most likely, yes.

Quote:
Originally Posted by IBee View Post
Is it safe to buy 4 and use my old tire as an emergency spare or do I have to buy all 5?
It would be ok for a short distance, but what are you really saving? Get the 5th and rotate all 5. You will increase overall tread life by 20%. It will also look obvious that you have a different spare.

Quote:
Originally Posted by IBee View Post
I don't think I will have to change to speedo gear ( think thats for when the tires are much taller).

Anything else?
The speedometer will be off by less than 1 MPH. Car / SUV / Van / Light Truck Tire Calculations
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Old 08-10-2012, 07:34 AM   #4
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My coworker runs this size on her Sahara.
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Old 08-10-2012, 01:50 PM   #5
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Thanks for the respone. That tire speed calculator was great.

Do you think the difference in acceleration on the highway will be noticable?
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IBee- 2012 Sahara Unlimited 4-Dr Silver, Black Hard/Soft top, Dark Sadle Leather Seats ,18" 7 Spoke polished 70th Anniv.Wheels, 32" Dueler A/T Tires, Black on Black "Jeep" anti-theft tire cover, mud flaps, Black grill inserts, Black hood scoop, Black door handle/side marker/tail light guards, Black gas cap door, aFe air intake & TB Spacer.
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