Originally Posted by
T-Mar
Maybe, like "clincher", the defintion of "triple butted" has changed with time. However, the above illustration does not represent the triple butted tubes employed by companies
such as Ishiwata, Fuji and Miyata, in the 1980s. Those triple butted tubes had only a single butt at each end, like a double butted tube, but unlike a double butted tube, the butts were a different thickness.
Of course you're right, I didn't take the time to look at the picture I posted!
On the other hand...
From Kaisei:
Kaisei 019E CR-MO Quadruple Butted Tubing
Chromium Molybdenum (CRMO)
Top Tube: Outer Diam- 25.4mm / Length- 580mm / Wall Thickness- 0.8mm> 0.5mm> 0.4mm> 0.7mm
Down Tube: Outer Diam- 28.6mm / Length- 630mm / Wall Thickness- 0.8mm> 0.5mm> 0.4mm> 0.8mm
Seat Tube: Outer Diam- 28.6mm / Length- 610mm / Wall Thickness- 0.8mm> 0.5mm> 0.4mm> 0.7mm
Head Tube: Outer Diam- 31.8mm / Length- 180mm / Wall Thickness- 1.0mm-
Chain Stays: Outer Diam 1-22.2 mm / Outer Diam 2- 12mm / Length- 410mm / Wall Thickness- 0.8mm-
Seat Stays: Outer Diam 1- mm / Outer Diam 2- mm / Length- mm / Wall Thickness- mm-
Fork Blades: Outer Diam 1- 28/20mm / Outer Diam 2- 12mm / Length- 400mm / Wall Thickness- 0.95mm-
Fork Steerer: Outer Diam- 25.4mm / Length- 200mm / Wall Thickness- 2.2mm> 1.6mm
The three main tubes on this set are clearly stepped down more than once.
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