Shimano Positron shifters

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The Fixer
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Joined: Wed Oct 02, 2013 12:45 am

Shimano Positron shifters

Postby The Fixer » Wed Oct 14, 2015 9:47 pm

Had a bloke in at the Shed the other day - old 27" Viscount (a Pommy job) with
a twin-cable Positron setup fitted, probably from new.

It's in working condition, but I managed to talk him into replacing it with some-
thing more modern and easier to set up (he's clueless) and to get parts for.

And so now it's in my shed, along with a single-cable Positron system, just wait-
ing for a suitable machine to fit them to.

Yes I know they suck, and why, so I don't think we need to go there.

But they ARE different, and a bit unique nowadays.

I don't care if it's a $20 Huffy or a $20k Colnago, as long as you're riding, and you're happy.

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Re: Shimano Positron shifters

Postby Duck! » Thu Oct 15, 2015 2:03 pm

For the benefit of anyone wondering, Positron was Shimano's original gear indexing system. Unlike modern systems, the indexing was in the derailleur rather than the shifter, and used a fairly rigid single-strand "piano wire" cable to both push and pull the derailleur between gears. Yes it sucks compared to modern systems, but in 1980-ish it was groundbreaking.

I've only ever seen one single-wire system in the wild; I didn't know there was a two-wire version until now.
I had a thought, but it got run over as it crossed my mind.

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