I use a Saris Superclamp EX Rack, works fine with 3.0" wide tires. The Saris Freedom rack will work as well, if you are looking to spend less money. You can also find the Saris rack discounted online. If you get a Saris, make sure it has the wider cups to accommodate plus/fat tire bikes. I've also noticed the weight of the Saris racks are less than most of the other popular brands.