Shimano Positron/PPS
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Details
Short Name:Shimano PositronYear Introduced:1975
Speed Range:6spIndexed Component:Rear Derailleur
General Information
Shimano's Positron systems were an early attempt at an indexed shifting system.  Unlike their later attempts, the Positron system was targeted at entry level bicycles, not road racing 10 speeds.  The name Positron was given to a couple of different indexed shifting setups from the mid 1970's through the mid 1980's.  Some used a single heavy duty cable to push/pull the rear derailleur, another used a pair of cables to cause the derailleur movement. 
Shifting System Component Variations
NameCategoryGearingYear Introduced
PositronShifters5sp1975
    Notes: 
PositronRear Derailleurs5sp1975
    Notes: 
Component List
Generally in Indexed systems, either the shifting or the derailleur component contains the indexing logic. Here is a list of components currently on VeloBase.com which utilize the Shimano Positron/PPS shifting mechanism.
Component NameModelGroupCompatibility
Shifters
Shimano LB-500, PositronLB-500PositronPositron
Shimano LB-700, PositronLB-700PositronPositron
Shimano LE-420, Positron 10-S ConsoleLE-420PositronPositron
Rear Derailleurs
Shimano DG-100, PositronDG-100PositronPositron
Shimano DG-200 Positron II, PositronDG-200PositronPositron
Shimano PositronPositronPositron
Shimano RD-P500 PositronRD-P500PositronPositron
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