Feature: Suitable for the following 3.3CM diameter tube, the frame on both sides of the inclined rod is recommended round or oval, the diameter can not exceed 2.5CM, greater than 2.5 cm or square frame tube. Designed for outdoor sports bike enthusiasts, Lock your belongings, travel safely. Stylish design, durable material is very suitable for outdoor sports mountain biking bike riders hobbies. Load less than 50 kg. Portable and lightweight. Design with high quality aluminum alloy and quick release. Simple installation, disassembly is also very simple.