In almost all cases for 35" tires, I usually start at 2760mm and work from there. You may also check the manufacturer's website and see if they list a "Rev per Mile" rating for the tires. Take that value and calculate mm using this formula:
1609344 / Rev per Mile = Tire Size in mm
Don't forget the "3 roll" method. Mark the tire and ground, roll the tire forward 3 times, mark the ground again and measure. Divide by 3 and there you are. Don't forget to convert inches to mm by multiplying by 25.4.
Hope this helps.
__________________
Bill Cohron - The Mad Doctor  
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