Sports: Loaded Xlite Binder Clamp (Blue, 31.8mm Diameter) - Loaded

Sports: Loaded Xlite Binder Clamp (Green, 31.8mm Diameter)

Photography: MECO Aluminum Bike Handlebar Mount Clamp Adapter 31.8mm for Camera Gopro HD Hero 1 2 3 - MECO Co.,LTD

Sports: Race Face Evolve Seat Post, Black, 31.8 6X100mm - Race Face

Sports: Race Face Ride XC Post, 31.6X350mm, Black - Race Face

Sports: Race Face Evolve Seat Post, Black, 31.8 6X110mm - RaceFace

Photography: GoPro Standard Bike Handlebar Seatpost Mount for Hero 1 Hero 2 Hero 3 Hero 3+ / Hero 3 Plus Camera - Gold - DSstyles

Sports: Topeak RX Beam Rack CB Carbon Fiber Bicycle Seat Post Rack - Topeak

Photography: Standard Bike Handlebar Mount Seatpost Mount For GoPro Hero 2, Hero 3, and HD Hero Original Cameras - Red - DSstyles

Sports: Loaded Xlite Binder Clamp (Silver, 31.8mm Diameter)

Photography: Generic Bike Aluminum Standard Handlebar Mount 31.8mm for Gopro HD Hero 2 Hero 3 Red - Generic

Photography: Generic Bike Aluminum Standard Handlebar Mount 31.8mm for Gopro HD Hero 2 Hero 3 Green - Generic

Toy: Millionaccessories? Standard Bike Handlebar Mount Seatpost Mount for Gopro Hero 2, Hero 3, and Hd Hero Original Cameras - MILLIONACCESSORIES

Photography: Standard Bike Handlebar Mount Seatpost Mount For GoPro Hero 2, Hero 3, and HD Hero Original Cameras - DSstyles

Photography: GoPro Standard Bike Handlebar Seatpost Mount for Hero 1 Hero 2 Hero 3 Hero 3+ / Hero 3 Plus Camera - Blue - DSstyles

Photography: GoPro Standard Bike Handlebar Seatpost Mount for Hero 1 Hero 2 Hero 3 Hero 3+ / Hero 3 Plus Camera - Green - DSstyles

Toy: Millionaccessories? Standard Bike Handlebar Mount Seatpost Mount for Gopro Hero 2, Hero 3, and Hd Hero Original Cameras - MILLIONACCESSORIES

Photography: Generic Bike Aluminum Standard Handlebar Mount 31.8mm for Gopro HD Hero 2 Hero 3 Red - YuHan

Photography: Generic Bike Aluminum Standard Handlebar Mount 31.8mm for Gopro HD Hero 2 Hero 3 Green - YuHan

Photography: Generic Bike Aluminum Standard Handlebar Mount 31.8mm for Gopro HD Hero 2 Hero 3 Blue - Generic

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Amazon.com : XLC Alloy Seatpost Clamp w/ Bolt, 31.8mm, Black : Bike Seat Clamps : Sports & Outdoors.

Customer Reviews: Thomson Bicycle Seatpost Clamp (31.8mm, Black)
It doesn't take much tightening of the bolt to get this clamp to do its job. Once tightened, the seat post doesn't go anywhere. I bent a seatpost because this clamp ...

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Seatpost Clamps | eBay
Modifiedbicycles KL68 Lock/Bolt On Seat Post CLAMP Size: 31.8mm / 34.9mm. 4 Photos ... J&L Ti/Titanium bolt Seatpost clamp 31.8/34.9-9g Red-Ultra Light.

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Silver Aerozine Clamp 31.8mm ... Ultralight 31.8mm Titanium Seatpost Clamps Only 11.5 grams ... KCNC SC11 Seat Post Clamp - Scandium Bolt ...