TransIt Convertible Seatpost Rack Description: The TransIt Convertible Seatpost Rack carries up to 22lbs on the rear of your bike for anything from quick store runs to long haul expeditions. Note: Do not attach to carbon or titanium seatposts, exceed the weight limit, or use as a passenger seat. Features: Fits 26.8 - 31.6mm seat posts Tough 6061 T6 aluminum construction Durable powder coated finish Perfect for mountain and trekking bikes Carries 22 lbs and loads with ease Includes a bungee strap for securing cargo Specifications: Seatpost Diameter: 26.8 - 31.6mm Platform Dimensions: 12.75" x 5.25" Material: Aluminum Weight Limit (lbs): 22lbs (10kg) Weight: 945g