The MX24 will suit a child of between 8 to 11 years old, depending on their height. Gears arrive on the scene in a big way at this age with 21 of them. A light frame with loads of clearance, suspension, tough wheels and cool understated colours. A lighter weight upgrade is also available in the shape of the Dimension 24. It may represent the last stop before 'Kevin the Teenager' moves in. Enjoy it while it lasts.