1974 claud butler gran sport

[isaacxyz]

i have recently aquired an incredibly ratty claud butler gran sport frame from around 1974 for cheap, i'm intending to build it back up into some kind of usable bike, but am lacking knowledge on seatpost sizes. It is neither 25.4 or 27.2 but some kind of middle size which ive never encountered. Has anyone got any experience with this model or claud butlers of a similar vintage? I am struggling to find an answer on the internet already so thought i would try here as someone may own one or similar and be able to help,

thanks,

isaac

 

[hamster]

Take it to a decent bike shop, they will have a seatpost gauge.

 

[pigman]

26.4 is a common size if a friend has one for you to try

 

[M_Chavez]

26.4 would make it a very thick-walled tube, wouldn't it?

They say that if you go to a bike shop, a bloke in there can shove a big fat graduated shaft up your hole to see how deep it can go.

I just have enough posts or shims kicking about so could find a match for mine.

Once you find out the size, you can get a shim for your 25.4 post.