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Unread 05-01-2013, 01:40 PM   #1
Nirav1122
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Should I go Wider or Taller?

Greetings,

I'm looking to buy a new set of tires for my 1998 ZJ (completely stock). It's the 4.0 engine but I have the 5.9 rims.

Currently I have 225/75/16 tires on it.

Should I stick with that size or go with 235/70/16? Will I notice a height difference?

Also, whats the biggest size I could go on them? I do some light off roading. I looked into getting a BB (2inch) but the shop said it would put too much stress on the car and I would have to do a lot of other suspension work as well.

Suggestions?

Thanks!

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Unread 05-02-2013, 12:02 PM   #2
Nirav1122
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OK forgot the 70 vs 75 is the aspect ratio.

So would the 235/70/16 be be taller or shorter than the 225/75/16?
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Unread 05-02-2013, 02:09 PM   #3
Bhamshooter
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Quote:
Originally Posted by Nirav1122 View Post
OK forgot the 70 vs 75 is the aspect ratio.

So would the 235/70/16 be be taller or shorter than the 225/75/16?
http://tire-size-conversion.com/

The 235/70/16 is a 29.5 x 9.25
The 225/75/16 is a 29.3 x 8.86

Barely taller, but a little wider.
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Unread 05-02-2013, 02:20 PM   #4
Charley3
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Ideal width tires for daily driver is from 9.5" to 10" wide, IMO. That is 245 mm to 255 mm wide. Get tallest that will fit and are from 245 to 255.

I'm not sure what size that would be on a ZJ.

How about a 245/75R16 load C. Like a Cooper AT3 or a Duratrac. That's a 30.5 x 9.5 R16 which is an awesome size, if it will fit. Might need some lift. I'm not a ZJ expert. So I don't know if that would need lift. If it does, probably only an inexpensive poly spacer.

Otherwise go with 235/70R16, which is a nice size. Get load C.
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Unread 05-03-2013, 06:57 AM   #5
cwadej
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Why is the ideal tire 9.5-10" wide? A taller skinny tire performs better in everything except deep soft sand, deep mud, or deep snow.

The rolling resistance of the wider tire will only lower MPG, increase noise, without signifcant benefits of traction.
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Unread 05-05-2013, 01:32 PM   #6
Charley3
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Originally Posted by cwadej View Post
Why is the ideal tire 9.5-10" wide? A taller skinny tire performs better in everything except deep soft sand, deep mud, or deep snow.

The rolling resistance of the wider tire will only lower MPG, increase noise, without signifcant benefits of traction.
He said "light wheeling". That implies it's a daily driver Jeep.

A narrow tire will be much better on road in all on road conditions, especially wet highways (less hydroplaning) and Winter roads. For a daily driver, being great on road is mostcimportant.

A narrow tire is plenty good enough for light off roading, and although it's not ideal for deep sand, it's good enough when aired down.

A wide tire is best for deep mud and deep snow (more than 18 inches IMO), but how often will he be in deep mud of snow deeper than 18 inches? Not much, if ever. He said light wheeling.

A narrow tire is much better on shallow snow, slush, hard packed snow, and ice, which are all challenging surfaces that a daily driver might encounter.

So for a daily driver, I think narrow tires are best, especially since he said light wheeling.

Also, the difference in gas mileage is substantial.

For a DD and light wheeling, I love 30 x9.5R15. No lift required, though it also works well with 1.5 to 2" lift. This is my set up.

For a DD and light to medium wheeling, I love 31x9.5R16 (245/75R16) load C. Need 1.5" lift. 2" lift is good too. I'd prefer 1.5" lift because it's all that's needed.

IMO

---

My personal policy is use least lift possible for your tire size, and don't go any taller than 31" tires for a daily driver.

I learned this from my prior two Jeeps. One was stock and pretty good with 30" tires. The other went through several lift heights 2", 2.5", 3", and finally 3.5". I tried skinny 31" tires, fat 33" tires, and skinny 33" tires. I used this Jeep for daily driver. It was great at 2" lift. OK at 2.5" lift. A few problems at 3" lift. Lousy at 3.5" lift.

It was a great DD with 31" skinny tires. OK DD with 33" skinny tires. Sucked with 33" wide tires.
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Unread 05-05-2013, 01:38 PM   #7
Charley3
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A 1.5" to 2" BB is inexpensive, works OK, and won't strain anything.

However, my preference for a little bit of lift is Old Man Emu springs.
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Unread 05-05-2013, 01:53 PM   #8
Charley3
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Is the OP reading this thread?
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Unread 05-05-2013, 07:54 PM   #9
mschi772
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Quote:
Originally Posted by Charley3 View Post
Is the OP reading this thread?
Calm down, Charley. You posted just a couple days ago then 3 times in only 20 min and worry the OP isn't reading? Not everyone checks-in all the time.

I echo the sentiment that there's no reason to go wider. Narrower is better in this case. For questions like "how much bigger/smaller will X size be?" I prefer the tool at http://www.miata.net/garage/tirecalc.html. You'll never need to ask about the dimensions of a given size again. I'm not sure what the fit limits are on a stock ZJ, but you can bet it's been asked and answered a bazillion times before.

I personally would stick with the stock 225/75r16. They're about as narrow as you can go, have lots of tire options, and are just about as tall as you can go under a stock ZJ anyway. The limit seems to be 30 or 31 depending on who you ask, and 225/75r16 is about 29". If you really feel the need for a taller tire, 235/75r16 is about 30" and about 9.15" wide.

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. BFG Rugged Terrain is similar. If I went off road any less than I do now, I'd roll with Firestone Destination LE or Continental CrossContact (LX20 or LX Sport)--virtually no contest in the highway tire department really imo.
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Unread 05-05-2013, 10:56 PM   #10
Charley3
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Deep breaths. Pant, pant. I'm calm now.

235 mm is 9.25"

So a 23575R15 tire is 9.25" wide.

Although I always say narrower tires are best for daily drivers, there is such a thing as to narrow off road, even for mild wheeling, and especially for moderate wheeling. 225/75R15 is much to narrow (and short) for off road, IMO.

I think 9.5" wide aka 245 mm is ideal width for an all purpose daily driver.

I have run 235/75R15 (9.25" wide) on a 96 XJ (which is lighter than ZJ) and 235 was great on road and good off road. However, it was slightly to narrow on sand and mud.

Then I went to 30x9.5R15 and it was a slice of heaven. The ideal width for all purpose use. As good on road as the 235 aka 9.25, but a lot better off road. The extra height probably helped off road too.

A 235/75R15 is great on road and good for light wheeling off road. A 30x9.5R15 is great on road, and great for light wheeling off road, and adequate for intermediate wheeling off road. Also a 30 is easy to fit with little or no mods.

So I vote for 30x9.5R15 because you gain a huge amount of off road ability without losing any on road ability. It's a great height and width.

For a daily driver that does some off roading, a 235/75R15 is good, a 30x9.5R15 is great. I wouldn't stay with 225/75R15 because it's just to small (to narrow and short) for off roading. IMO
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Unread 05-05-2013, 11:21 PM   #11
Charley3
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I suggest Cooper AT3 in 235/75R15 or 30x9.5R15.
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Unread 05-06-2013, 09:23 AM   #12
Nirav1122
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Quote:
Originally Posted by Charley3 View Post
Is the OP reading this thread?
Yes.

Cut me some slack, I was fishing and grilling all weekend haha.

Nice cooper tire selection but I think I'm obsessed with the BFG AT tires. Probably the most aggressive looking ones I've seen that still good enough for daily driving. The problem with those are that it does't come in 235/75/16 and 245/75/16 will be too big for stock. My ZJ has 187k miles but in excellent shape, but I don't want to put any kind of stress with a BB.

So it pretty much comes down to 225/75/16 or 235/70/16. I may just stick with the 225/75/16. Cheaper and probably better suited for me.

Just wish the BFG AT came in 235/75/16.
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Unread 05-06-2013, 11:19 AM   #13
Nirav1122
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Ah! I think I'll go with 235/70/16. It's almost the same height but a taddd wider to give it more of a beefier look.
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Unread 05-06-2013, 12:48 PM   #14
RIPNBST
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I dont know why you are worried about stress. BB and stress are not used in the same sentence as far as I am concerned.
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Unread 05-06-2013, 06:15 PM   #15
mschi772
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Yeah, you should stop going to whatever shop told you that a BB would put too much stress on a ZJ.
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