The Challenger Plus and the Heavy Duty Challenger have a long loop of the rack makes it easier to park bikes. The Challenger winder bike rack is another excellent wave bike rack option for retail spaces, schools, or other locations where bike parking is a priority. The bike racks are available in galvanized, powder coated, or stainless steel finishes. It's compatible with up to 13 bikes and mounting options are in-ground or surface mounted.