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Old 02-06-2011, 12:07 AM   #1
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skinnier tire on a 4banger?

ok so i have an auto 2000 wrangler tj 2.5l 4 banger 3.73 gears. it sits on 31's. i bought the 3.25 rc susp. lift.
my question is...(noob question?) if i were to buy 33x10.5 tires, since the tires are thin would i have a better driving experience despite the fact that my gears are stock? i really want to get some 33's. without regearing. or should i go with a thicker 32 inch tire?
all suggestions are appreciated..

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Old 02-06-2011, 12:29 AM   #2
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is this statement true "I am not sure if this is a consideration, but wouldn't a skinnier tire (say 33x10.5) weigh less than a normal (33x12.5). Less weight/rotational mass should mean that your axles, brakes, and engine don't have to work as hard to start and stop the tires."

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Old 02-06-2011, 12:53 AM   #3
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the skinnier tire will require less power to move, but i very much doubt it will have the effect you are looking for.
ex: a 33 inch tall bfg at that is 10.5 inches wide is only 6 pounds lighter per tire compared to that 12.5 wide version.
now that 10.5 wide tire weighs the same as a 32x11.5 in the same tire, but the 32 will drive better due to the smaller diameter.
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Old 02-06-2011, 01:08 AM   #4
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so with my 2.5 auto the skinny wont help, but the diameter will? so if i were to get 32x12.5 it would be better opposed too 33x10.5 or 11.5 ?
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Old 02-06-2011, 01:10 AM   #5
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the 33x10.5 would be like middle ground between the 32 and the wider 33
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Old 02-06-2011, 01:14 AM   #6
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with a rc 3.25 lift. and 3.73 gears on a 2.5. between 32 and 33. what would you recommend for looks and somewhat a good driveability (although i know it wont be great) overall without regearing, what do you recommend, you seem to be wise!
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Old 02-06-2011, 01:17 AM   #7
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haha. i would not call myself wise. ive just learned a lot from this forum.
if you mean between the skinny 33 or the 32, i would go with the 32 because there is a better choice in tires in that size. the only tires i have found in 33x10.5 is the bfg at and the bfg km2.
the at is an ok tire, and IIRC, the km2 is still on some national backorder
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Old 02-06-2011, 01:55 AM   #8
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I had a 98 TJ with 33x9.50s BFG Mud Terrains and it would surprise everyone including myself where it would go, stock 4.10 gears, 2.5L, open diffs. They don't make that tire anymore..
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Old 02-22-2011, 09:24 AM   #9
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i love this forum,

would changing from 3.73 gears to 4.10 make any difference at all having a 2.5L I4 6spd man TJ and 35" tires with 3" lift
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Old 02-22-2011, 09:39 AM   #10
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The tire's diameter has more to do with how it affects performance than the tire's width/weight/mass does. A 33x10.50 will help the 2.5L perform better than it would with a 33x12.50 but not by a whole lot. The tire's diameter dramatically affects both the overall drivetrain ratio like changing axle gear ratios does, as well as affecting the weight and mass.

Semper Smith, changing to a lower axle ratio from 3.73 would have a dramatic improvement with 35" tires but 4.10 is not even close to being a low enough ratio for 35" tires with the 2.5L engine. 4.88 is recommended for the smaller 33" tires with the 2.5L engine and you can't regear the factory axles to the lower 5.13 ratio 35" tires would need with that engine. Personally, the biggest tire I would run on the factory Dana 30 and Dana 35c axles with the 2.5L engine is a 33".
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Old 02-22-2011, 11:27 AM   #11
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I have a 2.5 auto and I would not go any bigger tires without a re gear. I went to smaller tires and it was the best thing I ever did.
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Old 02-23-2011, 04:15 AM   #12
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ok so 33" tires is max on stock D30 and D35 and the recommend gearing is 4.88, the lowest the stock axles can be regeared...

flyin-lowe, what was ur setup like with ur 2.5 auto


thanks for all help
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Old 02-23-2011, 09:30 AM   #13
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Semper smith, what transmission do you have?
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Old 02-24-2011, 02:50 AM   #14
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jerry,
im currently in the market for a jeep and am trying to get as much "homework" done as possible. one ive been looking at is a '05 TJ 2.5 I4 with 6spd man tranny and id figured i ask as much as i can, the other one is a '05 unlimited with the 4.0 I6 and auto trans
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Old 02-24-2011, 08:30 AM   #15
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Between those two, I'd definitely (!!!!) go for the 4.0L with the auto trans.

That's what I'm running now and on my previous TJ with the 4.0L, I converted it from its original factory 5-speed to an automatic which simply works better offroad. The 2.5L is fine for pure offroading but the 4.0L is a much better choice for the streets and highway and gets about the same mpg because it doesn't have to be pushed as hard as the 2.5L does. The tougher the trail the better a Jeep will do with an automatic that gives a lot more low-end torque with better obstacle crawling abilities.
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Old 02-24-2011, 08:34 AM   #16
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well i have a 2000 jeep wrangler tj also 4 banger and a 2.5 inch lift and i fit 33" mickey thompson baja claw and i get no rubbing or hitting.. i recomend them.
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Old 05-18-2011, 08:25 PM   #17
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Quote:
Originally Posted by Semper_smith View Post
jerry,
im currently in the market for a jeep and am trying to get as much "homework" done as possible. one ive been looking at is a '05 TJ 2.5 I4 with 6spd man tranny and id figured i ask as much as i can, the other one is a '05 unlimited with the 4.0 I6 and auto trans
a 2.5L is going to be a 5 speed, the 6 speed was with the 2.4L...
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Old 05-18-2011, 09:23 PM   #18
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my 97 is a 2.5 i run small 235/75/15's on it with 410's and still find it gutless.... the stick shift helps though and i love er to death.
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Old 05-18-2011, 09:51 PM   #19
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I have a 2.5l, 5 speed manual and run the BFGs 33x10.5r15. Love them! They are great off road, around town and the highway.
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Old 05-18-2011, 10:05 PM   #20
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I used to own a 1995 YJ with a 2.5L, 3.73, and the same automatic transmission. I was also running 33x10.5 BFGoodrich KM2s

Essentially, the vehicle is nearly useless on the highway. Has trouble keeping 55, and the mpgs dropped to a dismal 11.

I learned my lesson and moved on to a 4.0L TJ. I will not put anything larger than a 31.x10.5 until I have the funds to regear. I won't go through that nonsense again. To much money wasted on gas.

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