what size seat clamp would be needed for a 26.6mm post?

It depends how thick the seat tube is. An aluminium tube will be roughly twice as thick as a steel one. I guess if it's steel, it could be as small as 28.6, certainly not smaller. Quite a lot of steel seat tubes are a 28.6 tube with external butting up to 29.8, which is why they make 30.0 clamps. If you had a tape measure, you could measure it.
 
The clamp on my karakoram is 30.0mm dia. The front mech is 26.8mm and the seat pin thingy is alos 26.8mm.So I reckpn 30.0mm could be your answer.But, of course it depends on the wall thickness of your tubes......... :shock:
 

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