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PostPosted: Sat Sep 28, 2013 8:48 pm 
retrobike rider / Gold Trader
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Location: Birmingham
Ok so it is probably not rare, but i have never seen one.

The mech came on an Orbit Frontier i picked up recently, from a pic of a complete Orbit i found i think it is original to the bike.

The series number is RD M531, but when i google this i get 9 speed and modernish deore.

The front mech is FD Z206 which is a road and atb front mech from 84-86.

the mech appears to be a specific atb/mtb style mech, not a road mech. but if it is 84-86 and for mtb i would have thought it would be on mombat.

mech is very well made , up there with slightly later lx and dx and not far of its contemporary xt i reckon, interesting spring set up too,


so has anyone got an info on this please? bikes it came on, where it fits in shimanos line up, year etc. i appreciate it is not a full gruppo

Image

Image

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Image

Image


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PostPosted: Sat Sep 28, 2013 8:53 pm 
retrobike rider / Gold Trader
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oh and the pic that makes me think it is original.

and my bike


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PostPosted: Sat Sep 28, 2013 9:07 pm 
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I think they were sold as simply shimano sis mechs and weren't that high up the food chain, about lx as you mentioned, but I could be wrong. Fairly sure a friend had a carerra road bike that came with them too.


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PostPosted: Sat Sep 28, 2013 10:10 pm 
retrobike rider / Gold Trader
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Location: Kent, UK
I think that was what they referred to as "Z" series, introduced in about '86, and only 1 step down from XT in those days. I have a set waiting to go on my Frontier.

It is on Mombat!


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PostPosted: Sun Sep 29, 2013 12:19 pm 
King of the Skip Monkeys
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Joined: Wed Nov 07, 2007 4:34 pm
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Location: Moomin Valley
Part of the first wave of SIS stuff as above - it went with this era of chainset:

Image

1987 Saracen wearing the same mechs

Image


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PostPosted: Sun Sep 29, 2013 12:40 pm 
retrobike rider / Gold Trader
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Cheers folks, got a bit of a lead from Harrycrumb

apparently it is closely related to shimanos "light action series"

http://www.disraeligears.co.uk/Site/Shi ... GS%29.html

they released it in 86 but kept it a bit quiet after suntours positron bombed, not sure if they wanted to see if it would work or how it would be recieved

http://www.disraeligears.co.uk/Site/Shi ... an_21.html

did a bit more digging on disraeli and then found this

http://www.disraeligears.co.uk/Site/Shi ... an_24.html

my mech, and it is atb off road specific. released in december 86.

which suggests my bike is perhaps 87.

I really didnt think Orbit or bikes made in the uk would be funky flouro colours this early as i always thought the uk lagged behind a bit and were less daring, obviously not given the fades on the two bikes above though 8) 8) 8)

will post a build thread on her soon :wink:


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PostPosted: Sun Sep 29, 2013 12:48 pm 
King of the Skip Monkeys
King of the Skip Monkeys
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Joined: Wed Nov 07, 2007 4:34 pm
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Location: Moomin Valley
It was probably one of the first Shimano slant parallelogram rear mechs that works all the way up to 9spd indexing. I have had a few but havent seen one in the flesh for a while.


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PostPosted: Sun Sep 29, 2013 12:52 pm 
retrobike rider / Gold Trader
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so would you be happy saying my bike is 87 Mark? did you get flouro bikes this early in uk? or were orbit cutting edge.

when was the first flouro bike?


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PostPosted: Sun Sep 29, 2013 1:53 pm 
King of the Skip Monkeys
King of the Skip Monkeys
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Joined: Wed Nov 07, 2007 4:34 pm
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Location: Moomin Valley
87 was the year of flouro, big surf and skate scene. Clothes, shoes, allsorts went flouro - I painted my Sony Walkman pink/ yellow to suit...


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PostPosted: Sun Sep 29, 2013 8:34 pm 
retrobike rider
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So glad you got the Orbit Charlie, I was a bit concerned that I might have messed things up by outing it.

I'll keep an eye out for that build thread 8) .


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