freestyle sized Seat Post - 400+mm

I need a standard freestyle sized seat post with the Nimbus/KH mounting bracket. I’m talking about the smallest diameter, I don’t remember exactly what that is. The trick is I need one that is 400mm or longer, longs legs and short frame…


Maybe this would do:

Silver or Black? (the second vendor is much closer to your location)

the diameter is 22.2mm