Suntour seatpost and shim advice please

Tugwell Gibson

Esteemed Pedelecer
Dec 30, 2016
277
315
56
London
Getting the right suntour seapost for.my bike. Hi all. I want to order the suspension seapost. I've taken mine out and it has a few bits of info stamped into it.

I think the most relevant is 28.6. I imagine that is the size of my actual seatpost. I believe the suntours come in 27.2 or 31.6.

So am I right in thinking I want the 27.2 post and a shim? But what shim? Would it be one called 27.2 - 28.6? That straightforward? Thanks.