The specialized dry tech fender set the dry tech fender set is an engineered fender set with extended research based length for superior water protection the fenders are made of a lightweight yet highly durable multi material design it39s also been engineered in our very own win tunnel in order to improve protection and to minimize water spray the fenders are available in three different sizes 35 45 and 52mm and they39re designed to work on bikes with 700c wheelsmdash