RockBros Bike Cargo Rack Quick Release Bicycle Carrier Rear Luggage Rack Alloy 165 lbs Capacity EASY INSTALLATION: Quick and easy to install on the seatpost. HIGH QUALITY: High quality aluminum alloy frame. Strong and durable. Both sides have baffle. COMPATIBILITY: Suitable for the sit tube which is less than 32mm diameter, also can be used in 26", 27.5", 29" Mountain Bike. LOAD: Max Capacity fixed with seat post and frame: 55Lb; fixed with seat post: 20Lb. USEFUL DESIGN: The total weight is only about 1300 grams. Suitable for V-brake and disc brake. The lower fork can be adjusted.