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[Closed] Anyone need a spare positron gear system for their 80s bike

cynic-al

Posts: 41395

Free Member

Topic starter

[#9513554]

Rare piece of history. We all have this to thank for indexed gears!

Posted : 25/08/2017 3:03 am

Poopscoop

Posts: 16680

Full Member

Not even seen one of those before.

So what's going on under the black plastic cover saying "positron"?

Is the indexing done on the mech instead of the shifter?

Interesting find! 🙂

Posted : 25/08/2017 3:16 am

shermer75

Posts: 13655

Free Member

Never heard of positron before- interesting stuff!!

Posted : 25/08/2017 8:30 am

tthew

Posts: 12568

Full Member

The most weird thing about it was the solid wire in the cable, which pushed as well as pulled the derailleur. No return spring needed.

Posted : 25/08/2017 8:35 am