Thread: Full titanium Brompton clone, now done (pics)
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Old 03-11-19 | 07:08 AM
  #50  
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tcs
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From: Parts Unknown

Bikes: Mike Melton custom, Alex Moulton AM, Dahon Curl

Originally Posted by Raxel
Brompton said their frames are made of hi-tensile steel. Let's assume it is AISI 4340 steel alloy.
Or maybe it's AISI 1040. Almost all bike companies in the world trumpet the metal alloy they use in their frames. Why is Brompton so coy?
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