Issi Trail Pedal, a reliable and durable clipless pedal designed to provide optimal performance and control on any bike, is suitable for both gravel and mountain bikes. Pedal axle size 9/16 inches. The pedals are made of high-quality aluminum material, ensuring long-lasting use. The pedals are compatible with SPD cleats and feature a 2-bolt SPD design. Whether you're a professional or a casual rider, these pedals are a great addition to your bike.