iliketobike
05-14-10, 05:35 PM
Dumb question, pretty sure I know the answer. Which end of the TT & DT goes to the HT? I presume the thicker / painted ends should be by the HT, right?
Framebuilders - Which end to miter?
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Eric Estlund
05-14-10, 08:05 PM
The painted end is not a reference as different mfg's can use paint to mean different things. Assuming that after the tube is mitered there is a "long" and "short butt, the long one usually goes to the head tube. Most round tubes have butts of equal wall thickness at both ends- when you say "thicker" end, do you mean longer butt, or an actually thicker wall? If you mean thicker wall make sure you haven't just turned a seat tube into a own tube.
PaPa
05-14-10, 10:27 PM
FWIW...
From Nova Cycles Supply: http://www.cycle-frames.com/bicycle-frame-tubing/TUBES-STEEL/
"The painted end of a tube is the SHORT BUTT SIDE. Make your minimum cut from this side and your adjusting cut on the opposite side."
And from Henry James: http://www.henryjames.com/butt.html
"Tubes with unequal double butting are marked with paint at one end. An asterisk (*) in the chart shows where the tube is marked.
Double asterisks (**) show where external butting occurs."
From Nova Cycles Supply: http://www.cycle-frames.com/bicycle-frame-tubing/TUBES-STEEL/
"The painted end of a tube is the SHORT BUTT SIDE. Make your minimum cut from this side and your adjusting cut on the opposite side."
And from Henry James: http://www.henryjames.com/butt.html
"Tubes with unequal double butting are marked with paint at one end. An asterisk (*) in the chart shows where the tube is marked.
Double asterisks (**) show where external butting occurs."
erik c
05-17-10, 04:25 PM
Balancing butt lengths is also a consideration to throw out there.
Some overall tube length/butt length to design tube length combinations just flat don't work very well.
Some overall tube length/butt length to design tube length combinations just flat don't work very well.
unterhausen
05-17-10, 06:41 PM
FWIW...
From Nova Cycles Supply: http://www.cycle-frames.com/bicycle-frame-tubing/TUBES-STEEL/
"The painted end of a tube is the SHORT BUTT SIDE. Make your minimum cut from this side and your adjusting cut on the opposite side."
And from Henry James: http://www.henryjames.com/butt.html
"Tubes with unequal double butting are marked with paint at one end. An asterisk (*) in the chart shows where the tube is marked.
Double asterisks (**) show where external butting occurs."
Depends on the brand. I mark the butts on my tubes so that I don't make mistakes and I can also choose where to cut and how much.
From Nova Cycles Supply: http://www.cycle-frames.com/bicycle-frame-tubing/TUBES-STEEL/
"The painted end of a tube is the SHORT BUTT SIDE. Make your minimum cut from this side and your adjusting cut on the opposite side."
And from Henry James: http://www.henryjames.com/butt.html
"Tubes with unequal double butting are marked with paint at one end. An asterisk (*) in the chart shows where the tube is marked.
Double asterisks (**) show where external butting occurs."
Depends on the brand. I mark the butts on my tubes so that I don't make mistakes and I can also choose where to cut and how much.