Shimano DG-200 Positron II, Positron
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Category:  Rear Derailleurs
Name:  Shimano DG-200 Positron II, Positron
Brand:  Shimano
Primary Group:  Positron
Model:  DG-200
Years:  Late 1970's - ?
Country:  Japan
Weight:  310 grams
Added By: JFischer on 07/19/07
Updated By: JFischer on 09/23/09
Additional Photos - click for full size
Shimano DG-200 Positron II, Positron
Outer Plate MarkingsPositron IIInner Plate Markings
MaterialSteelDesign Category
Attachment Bolt SizeClawCable Attachment Bolt Size8mm Wrench
Shifting SystemsPositronCable AdjusterNo
Cage LengthShortMax Cog Size28
Max Chain Wrap  
General Information
The short lived Shimano Positron system allowed you to shift while standing still.  Instead of a freewheel on the rear cogs, the freewheel mech was placed in the crankset.  Allowing you to spin the chain while standing still and thus operate the shifters to change gears.  Found on lower end bicycles of the 'bike boom' era.
Quality:Rarity:
 
 
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Additional Resources
Resources:Reference & ChartsCatalogs
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
PositronShimano1975 - , RecreationView 10 Components
Brand Information(click to expand)

Shimano Model Number Prefix List:

BB Bottom Bracket BL Brake Lever BR BRake
CB Coaster Brake CJ Cassette Joint CN ChaiN
CP Chain Protecto CR Chain Ring CS Cassette Sprockets
DF chain DeFlector DH Dynamo Hub FC Front Crank
FD Front Derailleur FE Fork Ends FH FreeHub
FS Front Suspension HB HuB HD HanDle bar
HP Head Parts (Head Set) HS Handle Stem IF Inter-3 Freehub
LP LamP MF Multi Freewheel PD PeDal
RD Rear Derailleur RH Rollerbrake Hub RM RiM
RR ReflectoRs RS Rear Suspension SB Shift Brake lever (Nexus, ?)
SC Speed Calculator (cycle computer) SF Single Freewheel Freilaufritzel SG Speed chanGe hub
SH SHoes SL Shift Lever Schalthebel SM SMall parts
SP Seat Post SQ Seat Quick release SS Single Sprocket
TL TooL WH WHeel ST Shift Brake Lever (STI, Rapid Fire, etc)
 
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