31s on my stock 2.5 - JeepForum.com
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post #1 of 24 Old 03-31-2020, 09:29 PM Thread Starter
Ga_Jeepin_91
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31s on my stock 2.5

I have a 2.5l stock height jeep. I was wondering how much would a 31' tire would change the pulling capablities of my jeep. I know my squirrel powered jeep doesnt have much power but how bad would it be affected. What i would like to put on there is 31' on a 15 x 10in rim. Just have some concerns for my power loss. Thanks.

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post #2 of 24 Old 04-01-2020, 04:39 AM
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Gearing in the axles?

When I had 31s on the 2.5 and 4.10 gears. It was fine.

As for "pulling". Do u mean towing or just drivability?

Stop whining about the 'ride' - If your YJ ain't wrangling your soul free, then might I suggest you buy a stationwagon... at least you can fit all your bull**** in the back.
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post #3 of 24 Old 04-01-2020, 04:49 AM
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His userid suggests Georgia so it may be accelerating he’s referring to or towing LOL

Anyway, you can see the effect of tire size on gearing by observing “in reverse” a tire and gear chart like this https://4lo.com/calc/geartable.php

With 31s the difference will be noticeable but nobody will be able to give you a subjective answer as to whether or not it will be acceptable to you or not

[size=3]Shackles & D-rings are different things.
Cranking IS turning over
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post #4 of 24 Old 04-01-2020, 04:08 PM
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The 31 dismater is fine on the 2.5. The 10" wide wheels on 31's is absolutely nuts. Since 31's are usually 31x9.5, a 7-8" wheel would be the max.

'93 YJ, '02 GM 4.3V6, SOA, dual ARB's, 8.8+D30(WarnHubs), 4.88s, 35" BFG KM2s, AX15, NP231+4:1+SYE+2LO, York OBA, Warn M8000.
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post #5 of 24 Old 04-01-2020, 05:51 PM
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The 31 dismater is fine on the 2.5. The 10" wide wheels on 31's is absolutely nuts. Since 31's are usually 31x9.5, a 7-8" wheel would be the max.
I find it's easier to find 31x10.5's ....see them for sale all the time.

Agreed an 8" wheel should be used.

Stop whining about the 'ride' - If your YJ ain't wrangling your soul free, then might I suggest you buy a stationwagon... at least you can fit all your bull**** in the back.
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post #6 of 24 Old 04-01-2020, 07:08 PM
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I find it's easier to find 31x10.5's ....see them for sale all the time.
You're right, I was thinking 20 yrs ago, before 33's. It was 30's that were 9.5, which I had. My 35x12.5's for the past 15 years have been on a 7" wheel with no odd wear at the right street inflation.
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post #7 of 24 Old 04-01-2020, 08:07 PM Thread Starter
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Just referring to power lost. Of course going up a hill I will have to downshift and my poor girl will have to earn her money but I've heard that the struggle will increase significantly. That's mainly what I mean. Also if anyone knew how bad gas mileage would be affect. I have 29' on it now on stock rims and get roughly 13 mpg. So just wondering with putting wider and taller tires on it what all could be affect.
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post #8 of 24 Old 04-01-2020, 08:10 PM
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It will affect your fuel mileage and your power.

You knew that already.

The difference will be fairly significant. You probably won't use 5th gear again. As far as gas mileage....... I have no idea.

The 4th 5-seater YJ in the world.
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post #9 of 24 Old 04-01-2020, 08:20 PM
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Originally Posted by Ga_Jeepin_91 View Post
Just referring to power lost. Of course going up a hill I will have to downshift and my poor girl will have to earn her money but I've heard that the struggle will increase significantly. That's mainly what I mean. Also if anyone knew how bad gas mileage would be affect. I have 29' on it now on stock rims and get roughly 13 mpg. So just wondering with putting wider and taller tires on it what all could be affect.
what???

that gas mileage is terrible for your setup. What gearing is in these axles?

Stop whining about the 'ride' - If your YJ ain't wrangling your soul free, then might I suggest you buy a stationwagon... at least you can fit all your bull**** in the back.
~YJOTM MAY '16~
~YJOTM JULY '19~
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post #10 of 24 Old 04-02-2020, 01:39 PM
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Quote:
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Quote:
Originally Posted by Ga_Jeepin_91 View Post
Just referring to power lost. Of course going up a hill I will have to downshift and my poor girl will have to earn her money but I've heard that the struggle will increase significantly. That's mainly what I mean. Also if anyone knew how bad gas mileage would be affect. I have 29' on it now on stock rims and get roughly 13 mpg. So just wondering with putting wider and taller tires on it what all could be affect.
what??? <img src="https://www.jeepforum.com/ubb/confused.gif" border="0" alt="" title="Confused" class="inlineimg" />

that gas mileage is terrible for your setup. What gearing is in these axles?
Ya, my 87 with the 4.0 and 3.08s gets 18-19 consistently on 235s

[size=3]Shackles & D-rings are different things.
Cranking IS turning over
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post #11 of 24 Old 04-02-2020, 06:37 PM
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Quote:
Originally Posted by bruinjeeper View Post
Quote:
Originally Posted by Ga_Jeepin_91 View Post
Just referring to power lost. Of course going up a hill I will have to downshift and my poor girl will have to earn her money but I've heard that the struggle will increase significantly. That's mainly what I mean. Also if anyone knew how bad gas mileage would be affect. I have 29' on it now on stock rims and get roughly 13 mpg. So just wondering with putting wider and taller tires on it what all could be affect.
what??? <img src="https://www.jeepforum.com/ubb/confused.gif" border="0" alt="" title="Confused" class="inlineimg" />

that gas mileage is terrible for your setup. What gearing is in these axles?
Ya, my 87 with the 4.0 and 3.08s gets 18-19 consistently on 235s
My 93 with 2.5, 5 speed and 31s, I avg 15-16 in town and 19-20 on the hwy. That doesn't account for the odometer being off 5% give or take.
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post #12 of 24 Old 04-02-2020, 07:48 PM
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Any major exhaust or intake leaks you can hear or know about? Tired engine? You should be doing at very least a little better than that.

Stop whining about the 'ride' - If your YJ ain't wrangling your soul free, then might I suggest you buy a stationwagon... at least you can fit all your bull**** in the back.
~YJOTM MAY '16~
~YJOTM JULY '19~
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post #13 of 24 Old 04-02-2020, 08:02 PM
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I have a 95 wrangler (stock). Please advise as to the exact tires needed to go from stock to 31's. In tire industry speak?
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post #14 of 24 Old 04-02-2020, 08:10 PM
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I have a 95 wrangler (stock). Please advise as to the exact tires needed to go from stock to 31's. In tire industry speak?
Okay in tire industry speak here's what you do. Pay close attention. Ready? Go to literally any tire or off-road parts website, or tire store. Next, look up 31" diameter tires or their metric equivalent. Buy and mount them. BAM. You've got 31s. P.F.M.
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post #15 of 24 Old 04-03-2020, 11:36 AM
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I have a 95 wrangler (stock). Please advise as to the exact tires needed to go from stock to 31's. In tire industry speak?
31x10.50-15
Kumho MT51 All-Terrain Radial Tire - 31/10.50-15 109Q https://www.amazon.com/dp/B01N8QUQ91..._Zp3HEb54NCQ30

[size=3]Shackles & D-rings are different things.
Cranking IS turning over
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