Two models are available, one suitable for road bikes and the other suitable for mountain bikes.Mountain bike (large size: 3.14 inches x 2.95 inches x 1.57 inches), Road bike (small size:1.57 inches x 1.57 inches x 0.78 inches) Small and beautiful, space-saving: Can be set in different states according to your wishes. High quality ABS material: The raw material of the product consists of high quality ABS that is durable. Match the actual design: The curved buckle fits the shape of the bicycle tire perfectly. The improved bike buckle adds two wheels to the opening so the tire can get in and out of the buckle smoothly. Unique corner design: This product adds a personalized design that can hang objects on corners. You can hang a helmet or gloves. The keychain hangs on the bicycle buckle.