Brompton top-tube thickness
08-18-18 | 09:48 PM
#1
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Brompton top-tube thickness
Hi guys.
I just signed up to this forum.
Nice to meet you all.
Anyway,
Does anybody know the tube thickness of Brompton's top tube? I assume 4130 chromoly
Thanks
Alberto
I just signed up to this forum.
Nice to meet you all.
Anyway,
Does anybody know the tube thickness of Brompton's top tube? I assume 4130 chromoly
Thanks
Alberto
08-19-18 | 05:31 PM
#4
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08-19-18 | 09:40 PM
#5
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Thanks for the replies
Thank you all very much for taking the time to reply.
I had fun studying chromoly tubing thicknesses yesterday. Common bike tube thickness is 0.6mm or 0.7mm in the middle and 0.9mm at the ends.
The Brompton may be a straight tube, about 1mm thick. Just a wild guess.
I had fun studying chromoly tubing thicknesses yesterday. Common bike tube thickness is 0.6mm or 0.7mm in the middle and 0.9mm at the ends.
The Brompton may be a straight tube, about 1mm thick. Just a wild guess.
08-19-18 | 10:11 PM
#6
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Bikes: In service - FSIR Spin 3.0, Bannard Sunny minivelo, Dahon Dash Altena folder. Several others in construction or temporarily decommissioned.
Thank you all very much for taking the time to reply.
I had fun studying chromoly tubing thicknesses yesterday. Common bike tube thickness is 0.6mm or 0.7mm in the middle and 0.9mm at the ends.
The Brompton may be a straight tube, about 1mm thick. Just a wild guess.
I had fun studying chromoly tubing thicknesses yesterday. Common bike tube thickness is 0.6mm or 0.7mm in the middle and 0.9mm at the ends.
The Brompton may be a straight tube, about 1mm thick. Just a wild guess.
08-19-18 | 11:16 PM
#7
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Bikes: Trek 730 (quad), 720 & 830, Bike Friday NWT, Brompton M36R & M6R, Dahon HAT060 & HT060, ...
08-20-18 | 07:52 AM
#8
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Joined: Dec 2006
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From: New Orleans, LA
The expensive part is that main tube is hand brazed. AFAIK hi-ten lends itself better to brazing. Not sure about thickness.
08-20-18 | 10:26 AM
#9
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Measured mine, 44.8mm outside diameter or 1.763 inches, so basically, 1 inch and 3/4..
IDK wall thickness, not inclined to saw it up to find out..
Labor has to be paid more in London England ,
than in China where Da Hon is located.
[SAE for 4130 has 0.8 %Cr, 0.15~0.25% Mn, C 0.28~.33]
....
IDK wall thickness, not inclined to saw it up to find out..
Labor has to be paid more in London England ,
than in China where Da Hon is located.
[SAE for 4130 has 0.8 %Cr, 0.15~0.25% Mn, C 0.28~.33]
....
Last edited by fietsbob; 08-20-18 at 10:33 AM.
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