Pump, pump, pump, pump me up ...

They have been around for years. I see nothing new in this one

I've never seen them, just thought peeps may find it interesting ...

I like you (phax71) have not seen this before it is a good idea, not everyone will use/want it and it will mean using a QR seat post clamp which means it won't be there when you come back to you're bike in some towns.

Yeah

I wouldnae use it myself .. I like to build my bikes up as light and as simply as possible ...

I just post these things points of interest occasionally...

dahon spec them on their bikes, tern too. Biologic make standard road-sized ones too