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Unread 12-06-2011, 06:25 PM   #1
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2011 WK 
Join Date: Oct 2011
Location: Chicago, IL
Posts: 142
Speed/Tire Size Calculator

Something like this may have already been posted, but I've seen several comments over various threads talking about how far off their speedos would be given a change in axle gears or tire sizes. Although I don't have a JK (yet!), I do have a WK2 and a friend of mine, also a WK2 owner (BMWister on another forum), made an Excel spreadsheet to quickly do some what-ifs for the Pentastar and W5A580. It was originally made for a WK2 forum but he gave me a "JK-copy" to make available here. Unless you un-protect the worksheet, you can only change the tire size and select from a few axle ratios so even a noob Excel user can work it without screwing it up. Hope it's useful to someone.

Download Link (Excel file):http://www.mediafire.com/?b8toaier11x1577

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Unread 12-06-2011, 11:56 PM   #2
RockyClymer's Avatar
2008 JK Wrangler 
Join Date: Apr 2008
Location: Colorado
Posts: 4,747
Since gears changed in the 2012, the mod may want to consider adding this to the FAQ....
08 JK 23S - Colorado Jeep Club No. 204
Too much to list - see my profile for details on build
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Unread 12-07-2011, 12:30 AM   #3
What was I thinking?
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2008 JK Wrangler 
Join Date: Sep 2009
Location: Los Angeles, California
Posts: 6,006
Page #2 in the F.A.Q.
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Unread 09-24-2012, 10:30 AM   #4
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Posts: 3
Iam using this. It's helpful when trying to figure out new gears or tire sizes
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