They are okay, getting better as mountain biking seems to becoming more popular. I live about 45 minutes from Kettle Moraine State Park. They are very good. Epically this time of year. They are usually rated on the top xx lists of trails. It is also where they were going to run the Olympic mountain bike events if the Olympics were in Chicago. It is really a pain right now though as I am in Pennsylvania for school and it is hard to find trails around here. Plus, I had to leave my bike at home this year.