Technical & Reference Section > Tech and Restoration

Seat Post SIzes ?

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brass monkey!:
Forgive me,.......but

Is a 7/8th inch size seatpost the same as a 22.2mm seatpost, they look the same? Why is one imperial and the other metric ?

or are they slightly different  :-[

gt0733:
i don't know the answer but i will say i bought 2 cro-mo 22.2 seatposts for my redlines. one slid straight in with no problems on the proline frame (1983) but the mid school frame(1990) was tight enough that we had to do a bit of massaging of the seat tube.

Trev:
i've got some primo seatposts for sale and they are labelled at 22.2mm (7/8"), so i guess they're the same.

Stodgy:
Yep, 22.2mm = 7/8"

brass monkey!:
I though so ;), but I bought a 22.2mm labelled seatpost, which was a real tight fit into an old school frame, I was worried I had got the wrong size....?

 :daumenhoch:

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