Features: Fits most bicycles models. Adjusted to fit most surfboards. Fits a surfboard thickness up to 3.15" (80mm). Can mount to seat posts 25mm to 32mm. Clever design prevents your bike and board from rubbing. Elastic rope ensures the board stays in the rack. Equipped to hold a weight capacity of up to 20kgs. Specifications: Material: aluminum + soft foam padded Weight Capacity: 20kg Tube Diameter: 28mm Distance from Bike to Rack: 20 centimeter Product Dimensions: 40-90 * 15 * 55 centimeter (L*W*H) Package weight: 1419g / 3.13lb Package size: 450 * 140 * 170mm / 17.72 * 5.51 * 6.69in Notes: 1. Please allow 1-10mm error due to manual measurement, thanks for your understanding! 2. Item color may show slight aberration due to different shooting light and monitor display. Package included: 1 * Surfboard Bicycles Rack