Hi, I've got a 1990 (I think) MF Courier Comp (red / black cracked finish, rear canti's) does anyone know the seat post size, I can't work out if its 26.4 or 26.6.
Often you find two sizes listed - the reason is that seat tubes ovalise a little from welding heat distortion. Some come out close to nominal, the others need 0.2mm smaller.
Annoyingly, whne faced with a frame it's suck it and see... try to measure with a vernier.