The Magnum chair has one extra vertical strap, making the seat and back about 2.5 inches wider. The Magnum chair is also made with a slightly thicker wall of aluminum, which makes it stronger. The recommended weight for the Magnum chair is 275 lbs., as opposed to the Classic, which is 225 lbs. Color choices for the Magnum chair are more limited than the Classic. However, custom orders are available. All other chair dimensions are the same between the two chairs.