Model with pull-out compartment #6061-T6 aluminum alloy; Load capacity in stationary condition: 19.2 lbs (9 kg) (EX: 7 kg) hinged seat post with clamp, bungee cord, Mountable seat post diameter: 1.0 - 1.2 inches (25.4 - 31.8 mm); Clamp height: 2 inches (510 mm) x W 125 mm x H 90 mm (90 mm (90 mm (90 mm x 90 mm x 90 mm) L 11.0 x W 4.9 inches (125 mm); Weight: 23.8 oz (688 g); *Do not use with carbon fiber seat posts. Product color and size: The color of the product may look different from the actual product depending on your display settings. Product specifications, logo design, etc. may be subject to change for product improvement. We also cannot answer measurements or personal fit that the manufacturer does not announce. Please be aware of