Let’s list frames with 26.2 seat posts….
 

Obviously Cinelli

I sold my 3ttt to a gent who said his Rossin called for 26.2. (He wrote a glowing review so I will stop doubting him.)

Just got a shop donation of several (10?) 26.2 seat posts.

maybe no one uses that size and their old campy rep convinced them they needed them. I don’t know.

anyway, who else uses 26.2?

IIRC, late 80’s Ochsner road bike with Columbus Aelle tubing was 26.2.

Wrong 26.8

Would almost have to be something metric for a road bike. 28.6 outside diameter tubes would have to be 1.2 mm thick at the top of the seat tube to yield 26.2 I think?

(I know a few MTBs are 26.2 here and there. Likely due to reinforced collar areas?)

I have 2 Macarios that require 26.2

Soviet HVZ higher end frames use 26.2 seatposts. Metric tubing.

My old early 80s Univega Alpina Uno uses a 26.2.

My silver Cinelli.
My blue Cinelli.
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:D