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Old 10-28-2010, 06:02 PM   #1
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Question biggest size tires w/o loosing allot of power

hey guys i got a i-6 and was wondering what the biggest size tire would be but not loosing a sufficient amount of h.p and mpg's

thanks

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Old 10-28-2010, 06:09 PM   #2
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Judging by your pic you have a YJ. In my experience you would be safe with 33s. If you want to run 35s you can but there will be a slight loss of power. Your best bet is snag used front and rear axles from a 4cyl YJ (direct bolt in) because they are geared at 4.10 where yours are either 3.55 or 3.73 (assuming they're stock). Taller gears make up for the loss of power. Hope this helps!

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Old 10-28-2010, 07:48 PM   #3
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yeah she has 3.73 but yeah thanks for the info
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Old 10-28-2010, 08:45 PM   #4
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Biggest i'd go for matching looks without losing too much would be some 31x10.5's
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Old 10-30-2010, 12:46 AM   #5
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What year yj is it mine is a 92. It has the 3.07 gears stock and my 33's really make 5th gear useless. If yours is an auto it may be different though.
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Old 11-17-2010, 03:09 PM   #6
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Hi guyz,...i have a 93 YJ 4.0LTR...gears are 3.55..and it sits on 33" muds also!..runs strong on the road and great in 4-low offroad...but i do have a full borla exhaust-aem brute force air intake-throttle body spacer and a firepower distributor kit..that most have gained me some extra hp!!...i want to go to 35" but was thinking if i got a similar weight tyre to the 33".. (57-60lbs) i should still keep my power???. but u will need to strenghten the D35 axle..mine has chromoly axle shafts (30% stronger) and a powertrax no-slip locker so im hoping it'll cope also!?
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Old 11-17-2010, 03:27 PM   #7
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yeah she has 3.73 but yeah thanks for the info
Are you sure they are 3.73's? Not sure any YJ's came with anything lower than 3.55's... Even then 33's would be the max IMO with a manual transmission.
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Old 11-18-2010, 02:54 PM   #8
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What year yj is it mine is a 92. It has the 3.07 gears stock and my 33's really make 5th gear useless. If yours is an auto it may be different though.
Dang... that means I have 3.07s and when I buy 33's my 5th gear will be useless. Hey one less gear to worry about lol

But I would say 31x10.5's. My friend has them on his 2.5 and he does well with them, although he has different gears then us 4.0s.
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Old 11-18-2010, 09:09 PM   #9
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Quote:
Originally Posted by Clawed95Riogrande View Post
Judging by your pic you have a YJ. In my experience you would be safe with 33s. If you want to run 35s you can but there will be a slight loss of power. Your best bet is snag used front and rear axles from a 4cyl YJ (direct bolt in) because they are geared at 4.10 where yours are either 3.55 or 3.73 (assuming they're stock). Taller gears make up for the loss of power. Hope this helps!
Dude, lower gears make up for increased tire circumference, not taller. 4.10 gearing is LOWER than 3.73.
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Old 11-23-2010, 02:32 PM   #10
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I would recommend 31s. 33s would work too but your going to really notice a difference from where you are now. One of the major things that robs power is weight and unsuspended weight like heavy tire/rim combos rob MPGs also.

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