I want to to put the biggest tires I can on the back of my daily driver. I want to keep the wheel wells just as they are from factory, so no tubs or other modifications. Is there a general rule for stuffing big tires into a wheel well. What is the minimum ammount of clearance that must be maintained when selecting new tires? For example, how much space must be provided for wheel/suspension travel? We have all seen tires so large/wide that they will just about hang out past the fender lips. If you hit a bump or pothole the suspension is going to allow the wheel to travel upward and closer to the fender lip. If the tire is already too tight in the wheel well, its going to rub or just plain get ruined by hitting the fender. So generally, how big can you go on until the tire becomes too big and will make contact with the inner fender or the fender lip? Must you leave an inch all around, two inches...or more?