cool little tire calc

here are the ones i usually use
http://www.1010tires.com/TireSizeCalculator.asp?action=submit
-gives very detailed size, and comparison for up to 5 tires i think(as well as telling how far off the speedo will be), as well as listing popular tires in that size, and OEM tire sizes for most vehicles
http://www.grimmjeeper.com/gears.html
-calculates tire sizes, as well as a bazillion options for transmissions/gear ratios/transfer cases, etc to get final ratio
http://www.bigcustomwheels.com/info_specs.jsp
just found this one yesterday, looks neat, but havent played with it much yet
 
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