Components - Shimano Positron shifters

On this page: Positron Shifters Single Wire Kit | Positron Shifter with Solid Wire | Positron shifter shifter set with no wire

Shimano STI & stem shifters (not 600/Ultegra or 105) are are posted here.
Shimano 600 & Ultegra STI shifters are posted here.
Shimano downtube shift levers are posted here.
Shimano bar-end shifters are posted here.
Shimano downtube shifters are posted here.
Shimano MTB/Hybrid shifter/brake lever sets are posted here.
Shimano shift lever spare parts are posted here.

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Here's is Shimano's history and explanation of the Positron shifting system:

Aiming to further spread the use of sports bicycles, in the 1960s, Shimano started to focus on developing shifting systems that were comfortable and safe for all users. Positron, which was announced in 1974, incorporated an index system named the Positron System. Positron II, announced in 1976, incorporated the Positive Pre-select System (PPS), in which by shifting gears in advance when the bicycle was not moving, the rider could start pedaling with the gears shifted. This made it easier and safer for the rider to start pedaling in a low gear and on hills. Also, Positron II used a steel wire cable instead of conventional wire, which successfully prevented a decline in shifting performance due to stretch and rust, which was a weak point in the use of wire.

However, the push-pull cable mechanism using steel wires had some problems. One was its high cost, and another was that it made it difficult for users to route the cable since it was fairly rigid. To solve these problems, in Positron III, announced in 1978, the wire returned to normal, and the index system was equipped with a shift lever, which became the blueprint of the later developed SIS. However, since it could not deliver sufficient performance as a shifting system at that time, it was not satisfactory.

In new Positron (PV 11), announced in 1982, an index system was attached to both shift lever and rear derailleur. However, this caused other problems: the two index systems could fall out of sync with each other and lever operations became heavy. These problems were solved by NEW Positron (NP11), which was announced in 1983. The newly developed double servo-pantograph mechanism adopted in the rear derailleur improved shifting performance significantly. Secure shifting became possible with the single index system incorporated into the shifting lever. This product became the origin of the later developed SIS.

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Shimano Positron Shifters Single Wire Kit. New, $75.00/kit

Part #70080

We have two in stock.

In its factory package.

The back of the header card.

Here's the shifter kit.

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Shimano Positron Shifter with Solid Wire

We have four: #1 | #2 | #3 w/white housing | #4

Shimano Positron Shifter with Solid Wire #1. Used, $40.00/each

Shimano Positron Shifter with Solid Wire #2. Used, $40.00/each

Shimano Positron Shifter with Solid Wire #3 with white housing. Used, $40.00/each

Here's one view

And from another angle

Shimano Positron Shifter with Solid Wire #4. Used, $40.00/each

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Shimano Positron shifter shifter set with no wire. Used

We have two: #1 | #2

Positron shifter shifter set with no wire #1. Used, $30.00/set

Positron shifter shifter set with no wire #2. Used, $30.00/set

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