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Double trouble gt pro performer

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Ady:
This looks a bit trick..
Twin drive cranks..

http://www.ebay.co.uk/itm/1986-GT-Pro-Performer-cheese-grater-mks-nos-old-school-bmx-Clem-twin-tribute-acs-/172004364056?hash=item280c424f18:g:w5UAAOSwcdBWTkJ5

BMX1973:
How did they do that?  :-\ I don't get how it would fit!  :-\ Wonder if it would give an advantage if racing!  :-\ Clever however it was done. :)

Retrodan72:
Surely it would be near impossible to align both chains exactly the same.  :-\

stidds:
BITD Clemtwin cranks were exactly the same.

You needed a Clemtwin crank (dual drive) and Clemtwin rear hub (again dual drive).

deeman:
They are pretty nuts! Do you think there was a real advantage when racing or was it just a gimmick? Surely the weight would be a disadvantage?  :-\

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