Wanted: Seat post for Bates

Looking for a good seat post for a Bates of Westcliff 1958 era. I have a selection of posts, the 27.2 is too big and my others are too small. Not actually sure what size is needed.

Get your bike shop to measure, they can also ream the seat tube if needed...

a Vernier gauge caliper is a useful and inexpensive tool, suitable for seatposts, bottom brackets etc. Maplins have digital ones for under a tenner....
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Cheers, thanks for the info.

The sizes go in .2 mm increments, so next smallest would be 27.0, 26.8, 26.6 (not so usual but 531 for large frames used that size)...etc etc. If 27 is too tight and 26.8 too loose then you would ream the seat tube slightly to fit a 27.0. Always get a new post if you can, as a used post could have been scratched then polished, (which may have marginally reduced the diameter ) and not a 'true' size tolerance wise.

I just bought a new digital vernier off eBay for 6 squid.

Hi,
All Bates (Horace) with Cantiflex tubing take 26.8 seat posts.
quite common to find them with a damaged seat tube as undersize posts are often fitted and stopped from slipping by over tightening the seat lug.
Terrific bikes to ride, the tubing seems to be one of the 1950's un orthodox designs that actually works ,I love mine.
Good Luck

Thanks for the help, looking forward to riding it!