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Old 06-21-09, 11:04 AM   #1
balindamood 
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1st Generation Dura Ace

These seem to come in two versions, regular polished aluminum and black. I have a full group in black. Black hubs, brakes, chainwheels, etc. It does not seem like standard anodizing or paint. I do not see it in the early (date codes are 1974) catalogs.

Picture:



Was there a difference between the black and the silver other than just color?
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Old 06-21-09, 11:29 AM   #2
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Here's the silver (no paint) version.

I picked this up on a Raleigh beater. If you want me to check any dimensions or anything else, let me know. The cranks are now off the bike.
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Old 06-21-09, 11:36 AM   #3
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I always assumed it WAS anodized (it's aluminum alloy after all), but now that has my curiosity piqued, I'll have to take a close look at one of the few early black DA things I own. Most black anodizing seems to bleach out to purplish gray over time, but this stuff remains black, just gets a little "chalky". So if it's paint it has to be something formulated to bond with AL alloy (most paints don't)...maybe epoxy-based(?).
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Old 06-21-09, 12:03 PM   #4
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It looks like they didn't offer black the first year:

http://www.sheldonbrown.com/shimano1973/

Once in a while, I'll try to remove black anodizing from parts with oven cleaner and it doesn't work. Then I switch to paint stripper. I just ran into that with some Tektro inverse levers that I want to make look a little less modern.

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Old 06-21-09, 12:32 PM   #5
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Quote:
It looks like they didn't offer black the first year:
The do not show one in '74 either, but as you can see on the picture, there is a rather prominent "YE" on the chainring (May 1974). The bike is a '75.
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