Does anyone happen to know the seat post diameter of the older 456 steel frame? I have one back in the UK and fancy fitting it with a Twelfty seat post which are on offer ATM. Thanks.

27.2mm

^ yep

Oui, my old old baby blue one was definitely 27.2, like every other MTB I’ve owned

Yip, 27.2mm.

The on-one twelfty are nice actually. I run one on my 456 and a very nice looking high polished silver one on the LHT

My black 27.2 Twelfty slowly slips down in my 456, as does my black WTB seatpost. It’s bloody annoying. 🙁 The same seatposts didn’t do that in my Inbred.

Luckily I’ve got an old beat up unbranded silver seatpost that dosen’t slip down 🙂

Thanks a lot guys. About to order one now. So next question is which colour for that blue frame?? ❓