Dimension 31.8mm Heavy Duty Seatpost Clamp Black - Philbrick's Ski, Board, & Bike
Amazon.com: 31.8mm / 34.9mm Titanium alloy Ultralight Bicycle Seatpost Holder Rear Rack Clip Bike Ti Seat Post Clamp (31.8mm) : Sports & Outdoors
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
Kris Holm Double Bolt Seat Post Clamp Black 31.8mm | unicycle.com
Bicycle 31.8/34.9mm Seatpost Clamp MTB Road Bike fit 27.2/30.8/31.6mm Seat Post | eBay
Seat Post CroMo (31.8mm) - CP/Chrome
Titanium Seatpost Clamp: 31.8mm & 34.9mm — TI CYCLES FABRICATION