Tires, Gears, Ratios and Charts -
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Unread 12-28-2013, 04:32 PM   #1
wilgeno's Avatar
2013 JK Wrangler 
Join Date: Aug 2011
Location: Saint Paul, MN
Posts: 319
Tires, Gears, Ratios and Charts

I was researching which tires/sizes I could/should run on my Jeep and found several places that had essentially this same chart for tire sizes and gear ratios combinations. I found it interesting. I'll let others decide if it's interesting or helpful to them.

'13 Commando Green JKU Black Hardtop, SmittyBilt SRC Side Armor, Spidertrax wheel spacers, TeraFlex 2.5 Coil lift.


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Unread 12-28-2013, 05:05 PM   #2
RockyClymer's Avatar
2008 JK Wrangler 
Join Date: Apr 2008
Location: Colorado
Posts: 4,441
Already in the FAQ section...and, it depends upon motor size, manual or auto tranny and tire lots of options.
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Unread 12-28-2013, 05:09 PM   #3
Web Wheeler
2008 JK Wrangler 
Join Date: Oct 2008
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Nice chart, however only 5 of the gears are useable in the JK/JKU and the chart-

Is calculated on a 1/1 rario and no comparison between manual/auto trannys--and no mention of speed-involved

One of the most important ratios in the JK/JKU charts is the rpm values based on speed/O/D, with quite a difference between the 6-spd manual and the auto O/D

The rpms listed are extreme when not considereing Auto-speed/O/D

For instance, my auto/5.38/33" tires, the tach turns 2600 rpm at 70 mph-

Not very valuable chart-sorry

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Unread 12-28-2013, 06:41 PM   #4
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As stated the correct charts are in the FAQ. Thanks for trying to contribute though.
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