Jeep Tire Tips - How To Choose Tires & Jeep Clearance Info
Here's a helpful clearance guide for Jeeps.
Suggested tire sizes for a variety of Jeeps.
How to choose between narrow tires and wider tires for offroad driving. There's also some helpful tire size information here, including how to calculate the dimensions of a tire.
As with all things, there are tradeoffs when it comes to selecting tires for your vehicle.
How body lift and suspension lift affect the size of tires you choose for your off road ride. Check here for a solution to your tire/lift problem. There's even a bit about fender trimming here.