Aero Seatpost Sizing?

[grellboy]

Just taken hold of a new TT frame, now sourcing parts. Anyway, thought I would start with the seatpost. The seatpost cavity in the seat tube is kind of oval/elliptical, so I'm guessing the standard measurements of circumference won't apply as seatpost will not be circular? How will I find one which will fit? Trial and error?

 

[Milkfloat]

Make, model and year of frame?

 

[grellboy]

Argon 18 e114

 

[Milkfloat]

I think you need a ASP-4000 Carbon Seatpost, but I cannot find anything in stock. These guys seemed to be the only ones that ever stocked it https://www.i-ride.co.uk/products/c...2011-asp-4000-carbon-seatpost/?sku=AR18-33470 so maybe give them a call and ask for ideas.

Normally the frame set comes with the seatpost. If you get really stuck I guess contacting Argon 18 would be the next step.