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Unread 03-12-2013, 02:14 PM   #1
Dwatts5250
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Tire sizes

Ok, before I catch too much Heck, Ive searched and still havent found the answer. I need some help understanding something.
My 97 XJ has tires on it that are 225/75/15. I know the 15 is the rim size, as for the other two sets of numbers 225/75, I am not sure what those really entail. Can I put tires on that are 235/70, or 245/75? ( I am lifting eventually, but only 2"-2.5")

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Unread 03-12-2013, 02:33 PM   #2
mschi772
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Using the example of 225/75r15....

225 = the width of the tread in mm = 225 mm wide
75 = the height of the sidewall (rim to tread) as a percentage of the width = 75% of 225 = 169 mm
15 = diameter of the wheel in inches = 15" wheel

Yes, you can change your tire size around. If you go to a size that has a different overall diameter than your stock size, be sure to change your speedo gear so that your odometer/trip/speedometer remain accurate. A tire size calculator like the one at http://www.miata.net/garage/tirecalc.html can show you how different tire sizes compare in their dimensions. http://go.jeep-xj.info/HowtoSpeedoGears.htm has everything you need to know about changing your speedo gear--it's SUPER easy.
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Unread 03-12-2013, 02:36 PM   #3
mschi772
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Keep in mind that beyond 30" in diameter is pushing it in terms of fit without rubbing and/or modification for a stock Cherokee. With that future 2+" lift, you should be fine up to at least 31" tires.

235/75r15 is a very popular size (about 29" diameter) with lots of tire options under a stock Cherokee (and was even a stock size once upon a time).

What do you do with your Cherokee? Is it primarily a daily driver? Does it see much offroading? Is it only for long trips?
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Unread 03-12-2013, 02:47 PM   #4
Dwatts5250
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Quote:
Originally Posted by mschi772 View Post
Keep in mind that beyond 30" in diameter is pushing it in terms of fit without rubbing and/or modification for a stock Cherokee. With that future 2+" lift, you should be fine up to at least 31" tires.

235/75r15 is a very popular size (about 29" diameter) with lots of tire options under a stock Cherokee (and was even a stock size once upon a time).

What do you do with your Cherokee? Is it primarily a daily driver? Does it see much offroading? Is it only for long trips?
Daily driver, with weekend trails. I dont plan on running this thing in the,Hammers, snd an occasional trip to OH to visit family. I had BFG all terrains on my YJ, and was looking at a set for the XJ, but the toyo at & general grabbers are cheaper.
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Unread 03-12-2013, 02:55 PM   #5
mschi772
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I'd recommend that you not go any wider than necessary if you're on the road a lot. Wider tires create more drag and suck more gas.

Quote:
Originally Posted by mschi772 View Post
BFG Rugged Terrain
Bridgestone REVO 2
Cooper Discoverer AT3
Firestone Destination AT
Goodyear Duratrac
Goodyear Silent Armor
Hankook Dynapro ATM
Kumho Roadventure SAT
Toyo Open Country AT 2

That's my short list of all-terrain tires in alphabetical order. You really can't lose with any of them. BFG RT and Kumho SAT are both milder for better or for worse (depending on how much/little and how extreme/mild you wheel).

As someone who uses his Jeep as a daily driver but goes off road occasionally, I chose a milder AT tire (some consider it a highway/AT hybrid)--Kumho RV SAT ($100/tire at Tirerack). BFG Rugged Terrain is similar. If I went off road any less than I do now, I'd roll with Firestone Destination LE 2--virtually no contest in the highway tire department really imo.
Sounds like you probably wheel more than I do, but that trip to OH for you is more highway time then I usually ever do also. BFG AT and Generals don't make it onto my short list these days because I don't feel like there's anything they do (with their rather dated tread designs) that these other tires can't do the same or better for the same price or less.
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Unread 03-13-2013, 10:15 AM   #6
Dwatts5250
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Awesome. Thats what I needed to hear. The idjit at the tire store trying to sell me a set of Mickey Thompsons bajaclaws for $1100, despite explaining its my DD, & not sure I'd need them. Now I know i
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Unread 03-13-2013, 02:09 PM   #7
mschi772
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Mickey Thompson Baja ATZ/STZs are decent tires. I never consider them because Mickeys strike me as overpriced and (the Baja Zs at least) don't have tread wear warranties. Claws on a daily driver though? Yikes, that guy was definitely not trying to give you the best tire for your needs.
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