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Old 08-02-2006, 11:18 PM
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H3 Hummer H3 Hummer is offline
Hummer Expert
 
Join Date: Jun 2005
Location: Seattle
Posts: 915
H3 Hummer is off the scale
Post Tire Size Calculator

http://4wdtires.com/category/_4wdtir...e_calculator_/

So the 285 / 75 tires are 32.8 inches

and the 315 / 75 tires are 34.6

1.2 inches more section width also
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