Bicycle 31.8/34.9mm Seatpost Clamp MTB Road Bike fit 27.2/30.8/31.6mm Seat Post | eBay
31.8mm/34.9mm Quick Release Seat Clamp - China Bicycle Seat Post, Bicycle Quick Release Seatpost Clamp | Made-in-China.com
MT ZOOM Ultralight 31.8 mm BLACK Seat Post (seatpost) Clamp 9g! (31.8mm) | eBay
Amazon.com: Saipe 31.8mm Bike Seat Post Clamp Seatpost Collar Aluminium Alloy SeatPost Clamp for 27.2 Bicycle seat Post MTB Bike Road Bike Casual Bike : Sports & Outdoors