Old 03-11-19, 07:08 AM
  #50  
tcs
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Originally Posted by Raxel View Post
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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