1991 alpinestars Al-Mega DX seatpost size?

Rampage

Retrobike Rider
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Does anyone know the correct size seatpost for this? I thought the origional one was in it which was 31.6 but a replacement (origional too short) has a lot of movement in there.

Thanks.
 
I measured the brand new one and it's 31.5mm in reality.
I tried a 30.9 with the correct shim and there's no movement at all.
I'll dig out the origional one at work later and see what it's like.
Thanks.
 
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