http://www.1010tires.com/WheelOffsetCalculator.asp
L logres Registered Apr 12, 2007 #2 This one is also pretty good: http://www.rims-n-tires.com/rt_specs.jsp
BigBoyBoelts Registered May 23, 2007 #4 Here is another one: http://www.bigcustomwheels.com/rt_specs.jsp