34.9 mm

The Promax QR-1 Quick Release Seat Post Clamp in red is designed specifically for BMX bikes used in racing. With a diameter of 34.9mm, this seatpost clamp allows for easy and quick installation and removal of the seat post on the bike. The durable and reliable brand of Promax ensures that this component will withstand the demands of high-speed racing while maintaining a secure hold on the seat post. Ideal for BMX enthusiasts looking for a quality and performance-driven seatpost clamp for their racing bike.