Amazon.com: WDHHNP Bike Seat Post Clamp 28.6mm is suitable for 25.4mm diameter seat Post Bike Road Bike Aluminum Alloy Seat Tube Clip Bicycle Quick Release Seat Clamp for Aluminum Frames Only. :
Tuf Neck style old school BMX seat post clamp 28.6mm (1 1/8") SILVER - Porkchop BMX
BILLET BMX™ SHIELD SEAT POST CLAMP 28.6mm – BILLETBMX.COM
Suntour Style BMX Seat Post Clamp - 28.6mm - 1-1/8" - Black - BMXGuru.com / C&W Cycle
SEATPOST - 28.6mm - Silver – I Like Your Bike
Amazon.com : 27.2 Seatpost 400mm LITEONE MTB Seat Post with 28.6mm 30.9mm 31.6mm Seatpost Shim Suitable for Mountain Bike Road Bicycle MTN BMX ( Include 3 Tube Adapters 15mm Setback ) : Sports & Outdoors
ZTTO Bike Seatpost Clamp 28.6mm 31.8mm 34.9mm Aluminium Alloy Bike Quick Release Seatpost Collar Mountain Bike Seat Post Clamp Black 31.8mm
Electra 28.6mm Seatpost Clamp with Rack Mounts - Electra Bikes