I have 31" x 10.5 x 15" wheel/tire set up. I purchased the set off of the internet so I'm not sure what the exact offset of the wheels are. It would appear there is a fair amount of negative offset as the tires stick out about 1 - 2 inches beyond the confines of the plastic fenders. This negative offset required me to cut a large chunk of fender off the front and bend/cut the plastic fender and metal corner immediately behind the front tires. Nothing is visible though and I am very happy with the result. I'm sure that if your offset is nearer to the stock offset that wider tires will not be a problem.