Here's how I was always taught to convert metric to standard tire size. Let's take a 275/65r18
275 mm = 10.83 inches -This is the width
65% of 10.83 = 7.04 inches - This is the side wall height
2x the side wall height + the wheel diameter = the total diameter
(2x7.04)+18=32.08
As the true size comes from the manufaturer, you should always check there numbers first, but this will always get you a very close approximation.
Cascade Offroad - Tyler
15012 Merdian East, Suite #1
Puyallup, WA 98375
253.840.1171
2000 Ford Ranger (Expedition)
1989 Jeep Cherokee (Wheeler)
1995 Jeep Wrangler (Wheeler)
A good tire size calculator:
http://www.1010tires.com/TireSizeCal...bmit&reset=yes
And tire manufacturers are very optimistic about their sizing.
I just checked the Compact Appliance website; looks like they no longer sell the 12 volt fridges with compressors.
This is the one I was looking at:
http://www.compactappliance.com/FP63...efault,pd.html
I'm starting to rethink my tire choice. I have 4.10 gears and based upon the reading I have been doing; without regearing, should I go to a maximum of 33" tires?
Everytime I start reading, I get confused about gearing v.s. tire size. I could use some help on this one!