The Sport Rack SR2813B Spare Tire Locking Bike Rack allows you to take your bikes to those great outdoor trails safely without scratching your car or bike. Compatible with all bike frames and sizes (BMX bikes, kids, women's, hybrids, road bikes and mountain bikes) and can accommodate oversized top tubes (2.5-inches or less). This rack can hold up to three bikes at once and attaches to spare tires for easy bike transport. The carrier features rotating clamps with rubber padding that holds the bike securely and includes locks to secure the bike to the rack and rack to the vehicle. This trunk mounted carrier measures 32-inches (L) by 6.6-inches (H) by 16-inches (W) and weighs 19-pounds.