25.4mm 28.6mm Quick Release MTBBicycle Seatpost Clamp Aluminum Alloy Mountain Bike Seat Post Clamp Feature: 25.4mm is generally suitable for seat posts with a diameter of 22.2mm; 28.6mm is generally suitable for seat posts with a diameter of 25.4mm (also for some steel frame models with 27.2mm seat tubes); The above parameters are only applicable to general aluminum alloy frames and carbon fiber frames. For some steel frames, iron frames and other ultra-light material frames, due to the different thickness of the frame tube wall, the applicable seat tube clamp size will vary. Specification: Material: aluminum alloy Product color: Black/Silver Inner diameter: 25.4mm/1.00", 28.6mm/1.13" Product size: about 65x45x18mm/2.56x1.77x0.71" (25.4mm) 65x48x18mm/2.56x1.89x0.71" (28.6mm) Product net weight: about 36g (25.4mm), 38g (28.6mm) Measuring method of seat post clamp size: It is roughly the outer diameter of the seat post, which is approximately equal to the size of the seat post + 2 times the thickness of the frame tube wall. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''''t hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it