So I ordered a nice new Thomson seatpost in my confirmed diameter of 29.8mm......and it doesn't fit!!!! In my defense I think it's quite hard to get an accurate reading using the internal calipers of a vernier on a tube when the difference is .2 of a mm and the shim has slots cut in it, so is compressible. The only other conclusion is that I'm just useless, but let's not go there.
So, what I can now say is that on MY '98 version of the Orange P7, manufacture date November 1997, the catalogue is correct, the seatpost size is 29.6mm. But I wouldn't like to make any definitive statements about your P7's. I suppose if you have any doubts you could always measure it (properly, not slapdash like me) :roll: .
Bloody retrobikes!
