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  1. #1
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    Gold Plated Dura Ace Sprocket Question

    I have a Dura-Ace sprocket and lock ring and I wondered if anyone can help me figure out how they have been plated. You can see from the pictures that they are coated in some kind of special golden material. I don't think it is titanium nitride like the EAI Gold Medal cog. I thought it may be just nickel coated / electro plated but is that possible in gold colour? I am also not sure if the coating functions to reduce friction or if it is just for show? Anyone who is knowledgeable about these things - I appreciate your help.





  2. #2
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    whoa

  3. #3
    Tarck bike dot com
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    Njs bling?
    Quote Originally Posted by thequickfix View Post
    Mah Arrospok Skids Hella Stupid Fresh

  4. #4
    Run What 'Ya Brung bonechilling's Avatar
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    Aren't these made by board favorite Tomity?
    Quote Originally Posted by doofo View Post
    the main cause of fit problems is riding your bike

    you should have just stopped riding so you could focus on color coordination

  5. #5
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    I have seen the one on Tomity's website. His are polished silver and not gold plated.

    And I agree, it is a bit of NJS uber bling...

  6. #6
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    Big Pimpin



    anyone need an avatar?
    Last edited by mander; 03-18-08 at 07:18 PM.

  7. #7
    Banned zelah's Avatar
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    that's crazy

  8. #8
    Rising sun on Keirin rider Tomity's Avatar
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    Quote Originally Posted by pipwish View Post
    I have a Dura-Ace sprocket and lock ring and I wondered if anyone can help me figure out how they have been plated. You can see from the pictures that they are coated in some kind of special golden material. I don't think it is titanium nitride like the EAI Gold Medal cog. I thought it may be just nickel coated / electro plated but is that possible in gold colour? I am also not sure if the coating functions to reduce friction or if it is just for show? Anyone who is knowledgeable about these things - I appreciate your help.




    Tomity is here!!

    This is not cog that I processed.
    As for this cog, polish is not done.
    My Tomity polished cog is nickel plate finish.
    I made 18K gold plating special cogs for Athens olympic games double gold medalist Mr.Ryan Bayley. It was a present of commemoration to him.

    Tomity

  9. #9
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    Hi Tomity
    Glad to make your acquaintance. Thanks for explaining that. I don't think my cog is real gold, I am still wondering how it was done.

  10. #10
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    I dabble in machining and fabrication...from my experience:
    It could be a brass electroplate. It's just for looks, there's been no polishing done and technically it is no longer NJS as they have strict color regulations...hence NONE of the color anodized Sugino/Nitto stuff is TRUE NJS anymore. Only black, silver and the champagne colors are technically NJS for ano'd parts. It's okay looking but certainly NOT the quality of the polished and plated cogs available.

  11. #11
    crotchety young dude el twe's Avatar
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    I don't think black is NJS anymore...
    Quote Originally Posted by CardiacKid View Post
    I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
    IRO Angus Casati Gold Line

  12. #12
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    really? Wow...sorry. I thought it still was...Hmmm...maybe because of all the other colors...black is too easy to fake? (Not factory?) I know it was...that's why there were runs of black 75's. Sorry for the misinformation.

  13. #13
    crotchety young dude el twe's Avatar
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    All I know is when my friend ordered black 75s they cam with no stamp.
    Quote Originally Posted by CardiacKid View Post
    I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
    IRO Angus Casati Gold Line

  14. #14
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    I was an electroplater from '98 to '03 and I saw tons of parts like this. Chances are good that (if they went with the most economical) it's zinc plating with a cheap layer of "yellow". While this would suffice, I'm hoping this isn't the case. Brass is definitely a better quality plating alternative. It's hard to tell from the picture which it is, but let's hope it's brass at least.

  15. #15
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    cogs aren't ano'd...they're iron oxided...blackened chemically...the ano'd black aluminum parts were what what was in question.

  16. #16
    どうでもいいよ
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    Looks like the ones they sell at Cycle Land(?) in Chiba. This shop sells chrome and gold DA cogs and lockrings.

  17. #17
    Senior Member nateintokyo's Avatar
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  18. #18
    Run What 'Ya Brung bonechilling's Avatar
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    Quote Originally Posted by stewardmike03 View Post
    really? Wow...sorry. I thought it still was...Hmmm...maybe because of all the other colors...black is too easy to fake? (Not factory?) I know it was...that's why there were runs of black 75's. Sorry for the misinformation.
    I'm pretty sure that he was joking. At least I hope so.
    Quote Originally Posted by doofo View Post
    the main cause of fit problems is riding your bike

    you should have just stopped riding so you could focus on color coordination

  19. #19
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    OK, seems like it could be brass electroplate then. I knew they were no longer suitable for Keirin but they do look great up close. Thanks for the comments.

  20. #20
    Rising sun on Keirin rider Tomity's Avatar
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    Quote Originally Posted by pipwish View Post
    Hi Tomity
    Glad to make your acquaintance. Thanks for explaining that. I don't think my cog is real gold, I am still wondering how it was done.
    Hi!! This is Bayley's gold cog plate
    Attached Images Attached Images

  21. #21
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    Quote Originally Posted by Tomity View Post
    Hi!! This is Bayley's gold cog plate
    Kirei!

  22. #22
    I spit hot fire Diggidy_Dylan's Avatar
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    Quote Originally Posted by pipwish View Post
    I have a Dura-Ace sprocket and lock ring and I wondered if anyone can help me figure out how they have been plated. You can see from the pictures that they are coated in some kind of special golden material. I don't think it is titanium nitride like the EAI Gold Medal cog. I thought it may be just nickel coated / electro plated but is that possible in gold colour? I am also not sure if the coating functions to reduce friction or if it is just for show? Anyone who is knowledgeable about these things - I appreciate your help.

    Wait, wait, wait....
    Are you telling us you bought that completely on looks knowing nothing about it other than it was "NJ****" and gold colored?
    Quote Originally Posted by awc380 View Post
    It's fine if you don't mind your bike bursting into flames, I suppose...

  23. #23
    All around nice guy BRANDUNE's Avatar
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    ?????????????????????????????????

  24. #24
    stay free. frankstoneline's Avatar
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    xoxo David
    Quote Originally Posted by metaljim View Post
    katana's out frank! always be ready.
    <edited>

  25. #25
    Memento Mori
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    A shmoke und a pancake. You know, a flapjack und a shigarette? No? Shigar und a waffle? No? Pipe und a crepe? No? Bong und a blintz? No? Well, then there ish no pleashing you.

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