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Old 03-26-2010, 05:19 PM   #1
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4cyl. with 31 inch BF goodrich all terrain?

Hey guys, i am looking to get some bigger tires for my little 4cyl. TJ. I am wondering if 31inch tires will cause to much stress on my 97' Tj and happen to break something in the process. What do you guys think? 31 too big?
Any suggestions!!
Thanks in advance.

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Old 03-26-2010, 05:23 PM   #2
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You should be alright, although I can't tell you from direct experience. I've got a 2.5L auto and I plan on upgrading to 31's in the near future. You might have some powerloss but otherwise it should be alright. I've seen 4 cylinders with 33's and lifted so I wouldn't be too worried about it.

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Old 03-26-2010, 05:30 PM   #3
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i have a 2.5 with a set of 31" dunlop mud rovers and there was a bit if power loss and 2-3 less mpg. it is a noticeable difference. i have an exhaust and intake and everything is back to normal, the main reason i got the upgrade is because i got a really good deal on both, 40% off each.
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Old 03-26-2010, 07:15 PM   #4
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Im running 32's with a 4 banger. Fifth gear never gets used now. General rule is no more than 33 without upgrading your axles.
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Old 03-26-2010, 07:33 PM   #5
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Will 29 inch tires look any different? I have 27 inch tires on there now...
Because I don't think I want to loose any more power from my little 4 cyl cuz it already has little power compared to 6 cyl!

What do you guys think?
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Old 03-26-2010, 07:34 PM   #6
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I run 30x9.5's with my 4 banger and plan to replace them with 31x10.5's this fall and I think it will be fine. 4 banger 5speeds come with 4:10 gears so that helps.
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Old 03-26-2010, 07:44 PM   #7
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Is there any difference between the 30x9.5and the 30x10.5
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Old 03-26-2010, 07:55 PM   #8
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I have the 2.4L with 31's and did not notice much difference at all. What kind of gearing do you have? I have 3.73.
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Old 03-26-2010, 08:20 PM   #9
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Have a 2.4 with 31x10.5. Did not notice any difference. Accelerates great, can still do 85 mph, depends on how I drive for mpg's. I have a manual 6 speed. The only difference is the speedo is off around 5 mph over 60 and up. If you want 31's do it. They look great!
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Old 03-26-2010, 08:25 PM   #10
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I'm running 32x11.50's with my 4 banger 5 speed with 4:10's and it runs well! I still use 5th gear on the highway running 75-80 mph no problem. I have a cold air intake, which may help a tiny bit at best.
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Old 03-26-2010, 09:18 PM   #11
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I'm running 32x11.50's with my 4 banger 5 speed with 4:10's and it runs well! I still use 5th gear on the highway running 75-80 mph no problem. I have a cold air intake, which may help a tiny bit at best.
Did you have to put in wheel spacers to fit the 11.50 inch wide tires?
What type of tires and wheels are thoughs?


PS. Your ride looks sweet!!!!!!
So jealous!
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Old 03-26-2010, 09:26 PM   #12
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I have a 2002 stock 4 Banger with 30"s BFG AT's and it moves along just fine.I have no problem keeping up with traffic. A friend of mine is running 31x11.50 Bridgestone Duelers on his 97 4 Cyl just fine too.
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Old 03-26-2010, 09:53 PM   #13
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Im running 31's on my 4cyl and i have no problems with it... im not sure what gearing im running i think 3.73 i can still run 80 on the interstate so you should be fine
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Old 03-26-2010, 11:41 PM   #14
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I don't think the engine is as much as an issue as the gears and axles are. With the 4 squirrels on stock gearing all should be well, but as you increase tire size your gearing will become more of an issue, and if you wheel it - your axles will come into play as well (depending on your wheeling style) just an example - My friend with a 4 cylinder was running 30's with 3.73 gearing - most went well except for on highway hills where he might need to downshift. He went to 33's and he couldn't even use 5th gear anymore, he put in 4.88 gearing and the 33's rocked but he had to be careful because he still had the D35, a deal came up where he traded straight up his 33's for 35's, the 4.88's still rock with the 4 squirrels and his crawl is sick. He had to go to an 8.8 but everything's been dictated by his gearing, not his engine size.
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Old 03-27-2010, 06:42 AM   #15
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I have 31x10.5's on my 2.4L with 3:73 and I can cruise in 6th gear on the highway no problem, and the VT highway is all hills. I have to downshift to 5th when going up a big hill but all wranglers do. 31" will be fine and you definitely won't break anything. Just don't slam on the pedal with the wheels at full turn or you might take someones head off with a flying U-joint, don't ask me how I know that.

If your going to go wider than 10.5 get some aftermarket wheels with less backspacing or if you must atleast wheel spacers or you will rub.
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Old 03-27-2010, 09:11 AM   #16
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Thanks guys i have considered your advice and am purchasing some 31x10.50 tires, still not sure what type though?

You guys are talking about gears, i don't no what my gear ratio is i think it is stock, because i just got this jeep over the winter. Should i change it? How do you change it? Higher or lower gear ration?
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Old 03-27-2010, 09:29 AM   #17
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Expensive to change. Parts are not to expensive it's the labor to change the gearing that cost $. I have a 2.4L with stock 3.73 gears, not sure what yours are but even if there 3.07 you should be ok with 31" tires. If indeed you do have a 3.07 ratio if you go any larger than 31" you will probably have some trouble keeping up speed on the highway.

Get under the jeep and look at the differential covers, there should be a tag attached to one of the cover bolts that says your gear ratio. Both front and rear will be the same. and you want to go up, for example if you have 3.07 you would want to move up to 4.10, 4.55, 4.88 etc.. the larger you go up in size with tires. I beleive 3.07 is the lowest ratio that came in wranglers but I could be wrong. The 2.4L 6spd comes with 3.73 and the rubicon comes stock with 4.10 or 4.11 I think.

if there are no tags on the diff covers than there are other ways to tell. You can open the differential and count the rotations (thread somewhere on the forum that explains it) or you can tell by your tire size, and rpms at a certain speed, do a google search on how to figure out your ratio if you don't have tags on your cover.
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Old 03-27-2010, 09:36 AM   #18
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I wonder when they changed the 2.4L to 3.73's. My 04 5 speed came with 4:10's. I wanted to order 4:56's but it was not an option unless you ordered a Rubi and I needed to get the cheapest model available for my DD since I was running 30-35k a year.

Then I started to car pool with 2 co workers and only drove every third week and the miles are way down. But I am back to my self and running 500 miles a week w/o weekends. Sucks.

And BTW, stick with the BFG AT's, mine have over 50k on them and still have 8-9/32's left.
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Old 03-27-2010, 09:43 AM   #19
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hmmm really? I didn't think any of the 4 cyl. came with 4.10's...I wish mine did.

This should help you also.

http://jeephorizons.com/tech/rpmchart.html
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Old 03-28-2010, 01:35 AM   #20
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I had a '97 4 cyl with 32's for a long time, spent a lot of time on the road, it was slow going up really big hills on the highway, but it still made it and then I put 33's which was terrible. I think with 31's you will be just fine.
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Old 03-28-2010, 01:36 AM   #21
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I'm also hoping 31's will be fine. I have a 2006 TJ with 6 speed 4 banger and plan on going with 31x11.5s.
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Old 03-28-2010, 12:55 PM   #22
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I have a 2.5 with a 3 speed auto (01) it came with 215/75/15's on it I swapped them for 235/75/15's and there is a little mpg loss, but so far I can anywhere except mud deep enough the stock frame gets stuck, it just takes a little longer
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Old 03-28-2010, 06:13 PM   #23
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i got a 99 4cly auto with 31" good year duratracks there was a huge loss of power with them. my jeep runs fine but its slow when offroad it keeps up with everyones stright6 and v8, my mpg is down to 10 but im putting a intake and exhaust to try to get it back to stock lol
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Old 03-28-2010, 06:43 PM   #24
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Your not slow, everybody else is speeding
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Old 04-06-2010, 02:33 AM   #25
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I just recently went from stock 215/75 15 wrangler rt/s to 30x9.5 15 cooper discoverer atrs. My first tank has shown 2mpg less. I have a 06 2.4l with 3.73's and stock lift.

They look better and I probably could have gone even with 31x10.5s.

IMO there is a noticeable difference in speed sustainabilty on the interstate. I live in WV and my jeep is my DD. I went from using 6th on the interstate except for hills to now not hardly at all except for real flat stretches. Big inclines I will even notice it dialing back in 5th gear, needing 4th to maintain speed limit. Speed limit is 70 here though and probably could get away rolling at 65 mph.

I would say the weight more than size is the overall slight drop in performance.

If you youre going to be trail riding then most people say at 31's.

If its your DD and youre mainly going to drive it on road, you could probably get away with all terrain 235/75 15 and get a better look with minimal performance loss.
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Old 04-06-2010, 02:45 AM   #26
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i'm rollin on 31x10.50 AT in my 4cyl, no problems, i have had them for over a year now. when i get the $$ i'm going to go up to a KM2 32x11.50. Its my DD, and i have no problems with it on the highway. i say do it!
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Old 04-06-2010, 05:16 PM   #27
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Well I found out on another thread about tires when I asked a question about sizes and mileage that my mpg loss isn't real, changing from 215 to 235 changed the readout on my odo, so everything is a little more than what i see, I did the math and I'm actually getting better gas millage with the new engine ( still a 2.5)
My question is with a 2001 Wrangler, atuo trans, all stock suspension parts, and no lift kits at all, how big of a tire can I use without rubbing? am I limited to 235's or can I get 30's next time?
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Old 04-06-2010, 09:10 PM   #28
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I have an '03 2.4 SE 4 banger man. trans. w/ stock gears (?) and just put on BFG 31's and did find it to be a tad slower in each gear, and did take away about 10 or so miles per tank full. Highway driving feels the same as I am still able to get up to 85 to 90mph.
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Old 04-07-2010, 08:07 AM   #29
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Well I found out on another thread about tires when I asked a question about sizes and mileage that my mpg loss isn't real, changing from 215 to 235 changed the readout on my odo, so everything is a little more than what i see, I did the math and I'm actually getting better gas millage with the new engine ( still a 2.5)
My question is with a 2001 Wrangler, atuo trans, all stock suspension parts, and no lift kits at all, how big of a tire can I use without rubbing? am I limited to 235's or can I get 30's next time?
You can go up to a 31x10.5 on stock wheels, no mods at all. You may rub slightly at full lock, but it can be fixed with a washer or two on your steering stops. Every TJ is different in that respect apparently. I bought mine with 31's and never rubbed, but others do.... Keep in mind your speedo and odo will be farther off than they are now...
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Old 04-07-2010, 04:00 PM   #30
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You can go up to a 31x10.5 on stock wheels, no mods at all. You may rub slightly at full lock, but it can be fixed with a washer or two on your steering stops. Every TJ is different in that respect apparently. I bought mine with 31's and never rubbed, but others do.... Keep in mind your speedo and odo will be farther off than they are now...
Thanks a million InfernoGirl that makes my options for tires better than I thought since 235/75-15's that tire size calculator site helped me figure out the size difference, and I did the math so now instead of getting 200 miles per tank I'm actually getting a little better than I did with the old 2.5 and the 215's on her, but I've been told by people who drive nothing but cars that I would have to "lift it up high" to use anything bigger than a 235, now I hear from the experts, and my tire options have gone up some

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