If you can't find a 24mm seatpost, you can get a 22.2 BMX seatpost and use some .9mm brass sheet to make a shim - or various other permutations of these figures to get it up to 24mm.
@lae started
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If you can't find a 24mm seatpost, you can get a 22.2 BMX seatpost and use some .9mm brass sheet to make a shim - or various other permutations of these figures to get it up to 24mm.