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A comment on Bicycle helmets haven't changed since their introduction. Parent comment

Re:Bicycle helmets haven't changed since their introduction by davidw on Tuesday June 18, 2013 @04:40PM (#5901926)
There were derailleur type things then, but nothing at all like the wide range of gearing that post WWII bicycles have.

http://en.wikipedia.org/wiki/Derailleur_gears

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