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'87 Schwinn Super Sport question

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'87 Schwinn Super Sport question

Old 09-25-19, 11:21 PM
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CycleryNorth81
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'87 Schwinn Super Sport question

The 1987 Schwinn catalog states the Super Sport's main tubes is made of Columbus Tenax double butted chrome-moly. However the seat post specified is 26.6 mm. Shouldn't the seat post diameter be 27.2mm if it is double butted?
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Old 09-26-19, 02:31 AM
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rccardr 
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Not withTenax, which is a seamed tubing.
Seatposts on all the Tenax bikes I've ever owned were 26.6.
That's a nice riding frame, regardless.
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Old 09-26-19, 07:11 AM
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"Double-butted" doesn't tell you anything about seat post size because it doesn't tell you anything about tube wall thickness - just that it is thicker at the ends. One butted tubeset could be 1.0/0.9/1.0 while another could be 0.8/0.6/0.8. Obviously the inner diameter of the tubes will be different despite both being double-butted.
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