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It is a BBB aluminium seat post that, I believe, was standard on this 'Team C' carbon Boardman
In that case it's definitely a regular ISO coarse metric thread, and any fit issues are down to damage.
gbj_tester-
Saddle was changed maybe two months ago,
and,
I don't remember the bolts being particularly hard to loosen/tighten.
Would neglectful, (no grease), corrosion of the (barrel?) nut lead to such an amount of play?
A standard M5 bolt wobbles in the remaining thread. -
Having consulted the Tester Approves thread,
I find: https://www.wiggle.com/brand-x-layback-6061-seatpost?
is out of stock in 31.6mm.
Is there an acceptable alternative?
mespilus
Thank you for the reply.
It is a BBB aluminium seat post that, I believe, was standard on this
'Team C' carbon Boardman, so shouldn't be 'very old'.
I'm currently trying to emerge from the rabbit hole of near-Ruislip bike shops.
The least useful answer so far, inevitably is from the Ruislip High Street Specialized Concept store where I was told that they didn't have anything 'that looks like that'.
('That' being the other intact bolt).
I asked whether they had any bolts that could give the same function, but of course not.
And, of course, they do not stock any 31.6mm diameter seat posts.