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Old 05-31-2018, 11:51 PM
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scottio's Avatar
Join Date: Jun 2017
Location: Antelope valley
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one more tire size question.

93 yj 2.5 5 speed stick. No lift. My jeep runs incredibly well with the 235/70x15s. 5th gear 70 mph no sweat and good getty up. I would like to go to 30" tires. That is only one inch taller. Will I really feel much difference? I am not ready to loose significant power but if the difference is negligible I would really like to make the switch. Any first hand advice?

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Old 06-01-2018, 06:53 AM   #2
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Location: Kansas
Posts: 660
Your current tire size is around 28”.
I would think you’d be okay to go to 30-
But how sagged out are your stock springs?
You’ll notice some power loss but it shouldn’t be to bad.
Something else to consider- it will throw your speedo off slightly.
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1969 Dodge Dart Swinger 5.9mag swap
1989 Jeep Wrangler YJ 4.2
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Old 06-01-2018, 10:15 AM
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Thanks. I have enough clearance and I know about the speedo thing. I am mainly concerned about loosing power. It runs surprisingly well for a 4 cyl. and I don’t want to loose that. Thanks again. I’m sure we are beating this old tire size question to death.
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Old 06-01-2018, 11:41 AM   #4

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How do you use your Jeep? Do you need more ground clearance or do you want larger tires for cosmetic reasons. Both are valid reasons.
I think you're headed into an expensive (5 tires) experiment. If you had a 6cyl, I'd say go for it. With a 4cyl, if you're happy with your performance and don't need additional ground clearance, I suggest you stay with what's working for you now.

Most auto enthusiasts agree that factory speedo settings read a bit fast, so larger tires just might put your speedo right on. I wouldn't worry about that particular facet.
If you're real concerned, a GPS speedo app for your phone might work. That way the government can track your travels.

Good Luck, L.M.
"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 06-01-2018, 12:53 PM   #5
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You absolutely will lose some of your current happiness.... you will gain other happiness....
Will it be worth it? Nobody but you can decide that....

How can we quantify how much you'll lose? You'll have to feel it for yourself

Maybe you can find a couple of fellow jeepers w 30" spares you can put on the back for a road test....
I come in peace.... I mean you no harm
Currently in the stable: ... 97 tj 4.0 5 speed stock....04 tj 4.0 auto 4" and 33's... 98 tj roller for future build... 94 yj sahara 4.5" RE and 33's... 92 yj sbc 3/4 ton axles and 38's... Cj5,7,yj,xj,ex mud dragster project

TJ dash speakers that actually rock! Kicker sub and amp in center console
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Old 06-01-2018, 04:16 PM   #6
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Join Date: Apr 2015
Location: Houston, Tx
Posts: 380
I have these General Grabbers 265/70 and a true 30" tire @ 30psi. and no problems in city driving or freeways at 70 mph, but would like more entrance ramp acceleration. Always want more. lol
I installed Heavy duty General Springs last fall and also 3/4" boomerang shackles and trimmed off approx. 1.5" off the lip off the stock rubber like fenders and 20" from payment to the bottom of the rockers. Jeep does well and gets me by for now, but mostly flat ground and have not off roaded YET.
However I would like to have a set of 31" Micky Thompson ATZ and extra set of wheels and can't quite justify it. Maybe a few more thousand miles.
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1990 black YJ, 2.5L.,4 cyl.,5 speed,TBI,Badlands 9000 lb.winch, 288,000miles.
33"x10.5" R15" Gen. Grabber x3,

2015 White JK, auto, 285/70/17 Duratrac ,Mammoth bead lock style, Engo winch,Rockrails/sliders, 2" lift.
2019 G.C.,4x4 Laredo,Granite Crystal.
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