Knobbies are a requirement. There will be miles of sand that you cannot ride on an 80/20 (street/dirt)tire. TKC 80’s are a pretty popular choice on the big bikes. They are also good road tires too. You will need to KNOW you can ride sand before this ride. This is not the place to learn how to ride sand. Spending some time in Maumee, Ohio on the off road area or in St Helen to work on your sand riding skills is a prerequisite.