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PostPosted: Fri Jun 03, 2011 5:45 am 
Dirt Disciple
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Joined: Wed Aug 04, 2010 10:02 pm
Posts: 75
Location: San Diego, California
I have a set of unusual Shimano 600 cranks (photo attached). The chainring spider has three short arms. Can't find anything online about these. Can somebody provide some information? The date code is AD, which I interpret as 1976. Thanks!


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File comment: Shimano 600 cranks, date code AD
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PostPosted: Fri Jun 03, 2011 7:33 am 
Old School Grand Master
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Joined: Wed Feb 20, 2008 12:21 pm
Posts: 5785
Location: Lost in Translation
1976 sounds about right. They're in the 1975 catalogue:

http://www.therecyclers.ch/pdf/shim75anglais.pdf

and they feature in a number of print ads from 1976:

http://www.velo-pages.com/main.php?g2_itemId=6568

but they're gone by 1978. Velobase has a little information:

http://www.velobase.com/ViewComponent.a ... 2&Enum=115

The bolt circle diameter is about 95mm, with spare rings available down to 30t. I don't know of any compatible rings: the more common 3-arm cranks used 116mm bcd.


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PostPosted: Fri Jun 03, 2011 3:03 pm 
Dirt Disciple
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Joined: Wed Aug 04, 2010 10:02 pm
Posts: 75
Location: San Diego, California
Many thanks for this very helpful information. I am always so very impressed by the expertise of the old guard on this site!


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