Modular design carries 2 bikes up to 60 lbs each and can be customized with Add-Ons to transport up to four bikes. Adjustable wheel block to accommodate wheel sizes from 20 inches up to 29 inches and tire sizes as wide as 5 inches. Dual-arm holders are compatible with a wide range of tire sizes and never touch the bike`s frame. Unique wheel trays pivot and nest for easy loading and compact storage. Constructed from US made aluminum and steel and tested to outlive the elements. Tilting feature allows easy hatch access without removing bikes. Complete Integrated Security: locks the rack to the car and the bikes to the rack. Compatible with 2` hitches only