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gbj_tester in reply to @fizzy.bleach

What types of frames need a 27.0mm seatpost and why?

Most 753 frames, and because that's what fits.

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fizzy.bleach in reply to @gbj_tester

Is that because of the butting thing or because the tubes have a smaller diameter overall (external and internal)?

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gbj_tester in reply to @fizzy.bleach

Is that because of the butting thing

Yes. The wall thickness is the same at the seat lug as it is in the middle, whereas DB seat tubes have a thick wall (compared with the middle of the tube) at the seat lug

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