Speed/Tire Size Calculator - JeepForum.com
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post #1 of 4 Old 12-06-2011, 05:25 PM Thread Starter
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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 It was originally made for a WK2 forum but he gave me a "JK-copy" to make available here.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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post #2 of 4 Old 12-06-2011, 10:56 PM
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Since gears changed in the 2012, the mod may want to consider adding this to the FAQ....

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post #3 of 4 Old 12-06-2011, 11:30 PM
What was I thinking?
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Page #2 in the F.A.Q.


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post #4 of 4 Old 09-24-2012, 09:30 AM
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Iam using this. It's helpful when trying to figure out new gears or tire sizes
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