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Old 09-04-2014, 11:56 PM   #1
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Good Tire Sizes

Hi, I'm looking for some advice. I just bought a 1999 Jeep Wrangler Sport and am going through my options and have found that there are a lot out there. This is my first Jeep and i'm super excited but I have found that excitement sometimes clouds judgement. I would love some of your thoughts. The jeep is primarily going to be used on-road as my primary vehicle, but would be off-road on trails from time to time. I live in the northwoods so the winters are pretty harsh. Also besides tire sizes and what tires you think would be a good tire to do with, I also would like to get a lift and would like your thoughts on the subject.
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Old 09-05-2014, 12:14 AM   #2
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How high of a lift? But you can for 31"s on there. I have 31"s and 10.50" wide with a 15" rim on mine and she has a 2" lift. But the wrangler duratrac's are pretty meaty looking and they do have sipping for more grip (in snowy slick conditions I believe). And the price isn't to bad at all in my opinion. From what I gave seen locally they are pretty popular. I've got some pics for you below for ideas
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Old 09-05-2014, 07:05 AM   #3
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You can run 31's stock, maybe 32's on road with washers on the steering stops. Another thing to consider is the MPG, which I am pretty sure goes down with larger tires than stock. This is the conundrum I am facing. Love the look of 33's and having an LJ it takes away the profile appearance which at times looks out of sync. I will probably opt for the 31's next spring. I picked up some used 30's with wheels that I am running through the winter.
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Old 09-05-2014, 10:17 AM   #4
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Now this may be a stupid question, but as far as MPG, 1. is there much difference in mpg between 31's and 33's? 2. as far as mechanically, is it difficult to change out between 31's and 33's?
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Old 09-05-2014, 10:49 AM   #5
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Your mpg's depend partially on what kind of tire you have. Max Traction OffRoad will get less than AT's. As far as going to 33's, as long as your lift and backspacing on the wheels gives you the clearance you need the only other thing you need to look at are gears.
Im running 2" lift with 255/70/18 (roughly 32). Mine is my DD, but have a 2nd set of wheels and tires for offroad.
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Old 09-05-2014, 11:07 AM   #6
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The size of tires you run will majorly affect performance if your axles are not regeared to match. I noticed that you have a "99". My "99" came with factory 3.07 gears which were the worst gear set they could put in a Jeep, but they put them in a lot of them. Unless you are planning a regear anyway, check and see what your differential gear ratio is before making a decision on tire size. Regearing usually runs between $1200-$1600 for both axles. If you have 3.07's, I wouldn't go larger that 31's, If you have 3.73 gears, you could get away with 33's, but neither would be optimal.

I suggest you do a search on the forum for threads on regearing, tire size, and lifts, and get a good understanding of how they all work together before opening your wallet.
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Old 09-05-2014, 11:47 AM   #7
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Quote:
Originally Posted by KSTJ View Post
Now this may be a stupid question, but as far as MPG, 1. is there much difference in mpg between 31's and 33's? 2. as far as mechanically, is it difficult to change out between 31's and 33's?
Your question maybe stupid.....but it's the same one I asked when looking at what size tire I may opt for. Remember, the only really stupid question is the one that's not asked. I felt the same way....how much different can the MPG be if I only increase the tires an inch?? I found out that it does affect it slightly, but if you don't get your speedometer calibrated then you check your mileage (this is the answer I got from a respected member)...it will be donkey crap.
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Old 09-05-2014, 11:49 AM   #8
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Quote:
Originally Posted by Water Dog View Post
The size of tires you run will majorly affect performance if your axles are not regeared to match. I noticed that you have a "99". My "99" came with factory 3.07 gears which were the worst gear set they could put in a Jeep, but they put them in a lot of them. Unless you are planning a regear anyway, check and see what your differential gear ratio is before making a decision on tire size. Regearing usually runs between $1200-$1600 for both axles. If you have 3.07's, I wouldn't go larger that 31's, If you have 3.73 gears, you could get away with 33's, but neither would be optimal.

I suggest you do a search on the forum for threads on regearing, tire size, and lifts, and get a good understanding of how they all work together before opening your wallet.
The wet dog speaks.......the truth and good advice.
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Old 09-06-2014, 01:51 AM   #9
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I too, reside in the White North. I just got 30 x 9.5 Genral Grabber AT2's. I felt narrower was better for snow, so didn't choose the 31 x 10.5's. But if you are going to get a lift it could look a bit strange without larger tires. Many people have the 31's or larger and do well in snow.
I was getting 18.5-19 mpg with my old Goodyear Wranglers 235 x 75's (at 40 PSI! because I knew I was going to scrap them and just wanted to see how good mileage I could get}. I have been running the new tires at 30 PSI and mileage so far (a couple of weeks) is about 17 mpg. Stock gearing 3.73, 4 speed automatic. No lift.

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