Here is a copy and paste from the FAQ2 in this section.

What can I fit on my 4x4?
Stock...29 -30 inches
1-2 inches... 31s
2-4 inches... 33s
4-5 inches... 35s
Check http://www.4wheeloffroad.com/techart...ide/index.html

What can I fit on my 2wd?
Stock... 235/75r15
1-2 inches... 30s
2-4 inches... 31s
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