Get a Grey Nimbus DoubleQuick seatpost clamp (31.8mm) for only £12 for one week only.
The Nimbus DoubleQuick clamp is a super strong way to secure your seatpost. Plus you can easily adjust your saddle height at the flick of two levers.
These clamps are the most secure clamps available on the market, but with the convenience of being quick release. If you are the kind of rider that likes to change their saddle height while out riding then this is the clamp for you.
This Clamp will fit a frame with an external diameter of 31.8mm. Common frames that this will fit are the Nimbus Oracle, Kris Holm and Impact Gravity.