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document updated 12 years ago, on Jul 5, 2011
the Browning hinged chainring ⇒ 2-speed BMX
history
magazine article, from Cycling Science Winter, 1995
, of the more complicated computerized version
the [shutdown] company's website was
browningcomponent.com
manual:
[1]
[2]
[3]
photos:
unboxing
installed
installed
chainrings