The Swagman Semi 4.0 add-on gives you the flexibility to add 2 additional bikes to your Semi 4.0 2 bike platform rack. The Swagman Semi 4.0 Platform Hitch Bike Racks are designed to transport all shapes and styles of bikes. This unique design features zero frame contact to preserve the beauty of your bike.  The Swagman Semi 4.0 Series features

• Fits most frame sizes, shapes and stylesZero frame contact
• Rear wheel ratchet straps firmly holds bikes and secures wheels
• Semi addon tramsforms your Semi 4.0 2 bike rack to 4 bikes in seconds

For more information see installation manual.  Please note this is an addon and not a complete bike rack.