The Raider R30 rack fits to seatposts with a diameter of 25.4mm-31.8mm. IT is particularly well-adapted for full suspension mountain bikes. Made entirely from aluminium, the Raider R30 is durable, lightweight and highly resistant to corrosion.It is fully adjustable so it can suit several different types of bikes. Installation and fitting is quick and easy due to it not needing any tools to set up. The side structures are strong and well thought out meaning that they hold bags of a high weight. Tech Specs: Material: High resistant hollow aluminium 6061,Mounting: On the seatpost: 25.4mm - 31.8mm,Maximum Load: 10kg (complying with ISO 11243:2016 standard),Platform dimensions: 120 x 335mm,Weight: 910g.