This Redline Silver Seat Post Clamp is a high-quality aluminum part that is compatible with a wide range of bike types, including single speed/fixie, balance bike, city bike, folding bike, mini bicycle, gravel bike, hardtail bike, racing bike, mountain bike, BMX bike, BMX bike - flatland, beach bike, fitness/crossbike, cargo bike, universal, cyclocross bike, fat bike, lowrider bike, BMX bike - racing, road bike, cruiser, mini BMX, hybrid bike, and recumbent bike. It has a diameter of 28.2mm and weighs only 2oz, making it a lightweight and durable choice for any bike. See pics.