its back bolt. I'm thinking of buying an air frame, but the bolt is missing and there is a groove cut in the seatpost, which i dont think should be there
that's not a columbus air seatpost - !
![](http://i.ebayimg.com/00/s/NzY4WDEwMjQ=/$(KGrHqRHJCcE63YFIJu2BOzo!itWlw~~60_12.JPG)
if the seat tube is air and the vendor is stuffing that down it then the seat tube will be deformed, steer clear
the air seatpost is often missing from 'air' frames/bikes, so a substitute is used instead, sometimes shimano ax, sometimes other
@rive_gauche started
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that's not a columbus air seatpost - !
![](http://i.ebayimg.com/00/s/NzY4WDEwMjQ=/$(KGrHqRHJCcE63YFIJu2BOzo!itWlw~~60_12.JPG)
if the seat tube is air and the vendor is stuffing that down it then the seat tube will be deformed, steer clear
the air seatpost is often missing from 'air' frames/bikes, so a substitute is used instead, sometimes shimano ax, sometimes other