Nimbus 28.6mm double-quick seat post clamp

Wanted, Black nimbus double quick release seat post clamp 28.6mm

Are you sure about 28.6mm ? this is not standard (25.4 / 27.2) for unicycling !

Clamp sizing is considering the outer diameter of the seat tube and not the inner diameter or seatpost size. So a 28.6mm clamp fits a 25.4mm seatpost and 31.8mm clamp fits a 27.2mm seatpost.

Nimbus DoubleQuick Aluminium construction clamp in Blue, Green, Orange, Red and white, with black levers and the the Nimbus logo laser etched on the front,

Weight: 90g.

These clamps will only fit frames with a external diameter of 28.6mm