Shimano RD-P500 Positron
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Category:  Rear Derailleurs
Name:  Shimano RD-P500 Positron
Brand:  Shimano
Primary Group:  Positron
Model:  RD-P500
Years:  Late 1980's
Country:  Japan
Added By: JFischer on 11/04/08
Updated By: JFischer on 01/24/11
Additional Photos - click for full size
Shimano RD-P500 Positron
Outer Plate MarkingsShimano PositronInner Plate Markings
MaterialSteelDesign CategorySlant parallelogram
Attachment Bolt SizeCable Attachment Bolt Size
Shifting SystemsPositronCable Adjuster
Cage LengthMediumMax Cog Size
Max Chain Wrap  
General Information
A much later edition of the Shimano Positron system.  Perhaps a very early SIS or a later (7sp?) era system that was below Shimano's SIS lineup?  Interesting piece indeed.  Was produced in both a medium cage "GS" and long cage "SGS" version.  Pictured above is most likely the medium cage variation.
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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