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  1. #1
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    Shimano 600 experts: Upgrade 6 speed to 8 speed

    I recently acquired a 80's era Serotta with a full Shimano 600 set-up. I was thinking of upgrading this bike from 6 speed to 8 speed. I am usually Campy guy so my knowledge here is limited.
    What components need to be upgraded? I want to keep the shifting to downtube shifters and run them as friction.
    What I think I need: an 8 speed rear hub, cassette, and new chain?
    Will the existing deraileurs work with an 8 speed upgrade?
    One more thing, where can I find a headset wrench for that crazy starfish nut?

  2. #2
    Senior Member Grand Bois's Avatar
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    You just missed a set of those wrenches on eBay:
    http://cgi.ebay.com/ws/eBayISAPI.dll...5644&rd=1&rd=1
    A 32mm wrench will work if you're careful.

  3. #3
    Senior Member MrCjolsen's Avatar
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    I tried converting 6 speed Shimano Exage to 8 speed and it didn't work. That's when I started getting into fixed gear.

    But the good news is that 8 speed derailleurs are really cheap. The shifters should work just fine if they're friction.

    You will need a new rear hub. Just go out and get a new cassette wheel. You have tons of choices.

    With 8 speed, you won't have many choices for gearing in the back. Pretty much anything but 12-26 is hard to find. But a SRAM 8 speed cassette is about $30 and the chain will set you back about $20. Yes, you will need an 8 speed chain.

    You will need to get your frame re-spaced (widened) if you want to do it right, although you can just pull the rear triangle apart and squeeze the new hub in.

    Also, a 9 or 10 speed rear derailleur will work fine. Including campy.

  4. #4
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    I just measured the dropouts and the spacing is 130mm. Will I still have to respace?

  5. #5
    Senior Member MrCjolsen's Avatar
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    No, unless you want to use an mtb hub, which you probably don't.

  6. #6
    Senior Member MrCjolsen's Avatar
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    An try the existing derailleurs. They might work.

  7. #7
    Senior Member Grand Bois's Avatar
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    Eight speed doesn't require a different chain, either. There's no reason to change derailers.

  8. #8
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    Sweet! I was hoping for a cheap change over. The bike is already a tank anyway!

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