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Those who skibike, know..
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327 Posts
Jaybike - I can have this answer for you within 12 hrs -- if no one else beats me to it.
 

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Up & Down
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57 Posts
RRX, FYI.
Almost every Ellsworth ST is externally and internally butted. The OD tapers down from 34.9mm(1.375") at the BB end to 31.8mm(1.25") at the top. So, seat collar clamp ID is different from front derailleur ID, and the wall thickness varies internally.
 

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Those who skibike, know..
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327 Posts
Perfectly stated by you El Sol -- my measurements given were at the top. Thank you very much for the clarification! [Note: this is why I try to steer clear of the tech stuff...]
 
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