A tire gearing question!
10-26-2010, 07:53 PM
#1
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Year: 1992
Model: Cherokee
Engine: Straight 6
A tire gearing question!
Well I wanta get 32s and I still have stock gearing I need some ideas of how thats going to change everything with that much bigger tires?
10-26-2010, 08:17 PM
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Year: 1992
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10-26-2010, 08:25 PM
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Year: 1995
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Engine: 2.5 4 cyl.
wont be bad, cant even tell 31s didnt come stock on my cousins xj, and its got 3:55's. So i think 32's will be fine as long as the weight factor doesnt play in somehow
10-26-2010, 08:30 PM
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Year: 1993
Model: Cherokee
Engine: 4.0 HO
I'm running 31's with the stock 3.55 and have plenty of power but you can always go with bigger gears to make it a little quicker.
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10-26-2010, 08:33 PM
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Year: 1993
Model: Cherokee
Engine: 4.0
Use the formula to figure out what gears you should run by rpms at a given speed.
MPH x Gear Ratio x 336 / Tire Diameter x Top Gear Ratio = RPM
Example: AX15, ( 70 x 3.07 x 336 / 32 x .79 = 1783 RPM )
If you have the standard ring & pinion ratio for the manual AX15 transmission it will be very high geared.
The chart above is for a direct 1.1 drive ( as in 4th gear in a five speed manual ) at 65 mph
MPH x Gear Ratio x 336 / Tire Diameter x Top Gear Ratio = RPM
Example: AX15, ( 70 x 3.07 x 336 / 32 x .79 = 1783 RPM )
If you have the standard ring & pinion ratio for the manual AX15 transmission it will be very high geared.
The chart above is for a direct 1.1 drive ( as in 4th gear in a five speed manual ) at 65 mph
Last edited by Rock Toy; 10-26-2010 at 08:51 PM.
10-26-2010, 08:34 PM
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Looking at your spec sheet that you put up on your XJ you have a manual, you have 3.08 gears. I went to 3.73 to give me better power and mpg ( yeah i know) on my 00 when i lifted it and geared it. If you had an auto I would say start around 4.10's. There are online charts that give you a good look at what your asking...
http://www.google.com/imgres?imgurl=...ed=0CCMQ9QEwAQ
This is one I found on google. Hope this helps.
http://www.google.com/imgres?imgurl=...ed=0CCMQ9QEwAQ
This is one I found on google. Hope this helps.
10-26-2010, 08:35 PM
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crap someone beat me too it while i was searching..... ah well 
10-26-2010, 08:50 PM
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Year: 1998
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Engine: 4.0 HO I6
I got 33's, but again I have an auto with the 3.55's. You ain't gonna be winning any races on the roads, but you can probably get by all right until you can swing a gear change.
Just don't go thinkin anyone is gonna call you Danica, Nascar Superstar
Just don't go thinkin anyone is gonna call you Danica, Nascar Superstar