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  1. #1
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    Low gearing for vintage Campagnolo

    I have no experience with campy, but i've offered to figure out how to get a 1:1 low gear on a campagnolo mirage 8sp drivetrain. The front is a triple and although i know i can add a 26t 74mm front ring... i anticipate chain drops, mediocre shifting, and an inconveniently large jump to the middle ring. I'm inclined to just drop it to 28t.

    So i'm looking at the cassette. Can i buy a 9sp 28t campy cassette and stack the cogs as i please, using the 8sp spacers?


    I'd appreciate any insight you might have regarding older campagnolo.

    Here's a picture of the lever reach adjustment screw i added.
    Low gearing for vintage Campagnolo-npdlmrq.jpg

  2. #2
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    I'm not sure the spacing will work as you propose (not sure about cog thickness), and the freehub spline pattern might have changed ingoing from 8 to 9. Not sure about that, either.

    Have you tried to find an 8-speed cassette with a 28? Miche may make one.

    Personally, I'd try the small ring first. Shifting might be a little funky, but I doubt that the 26 would be much worse than 28.

    As an old-timer, I am amused to hear early 90s Campy equipment described as "vintage." From your heading I figured we were going to be talking about 5-speed freewheels and friction shifters. ;-)

    Good luck to you and your short-fingered friend. That adjustment screw looks like a pretty clever kludge.
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  3. #3
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    If you want to use 9 speed cogs on an 8 speed body, you'll have to file the cogs so all the splines are the same width. 8 speed cogs were all loose, and were marked as to the order to install them on the body.......I can't remember if 9 speed cassettes were loose, or on carriers....(and if they were the same thickness as 8 speed)......There are a few campy experts here.
    If your opinion differs from mine, ..........Too bad.
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  4. #4
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    Quote Originally Posted by bubble View Post
    ....

    So i'm looking at the cassette. Can i buy a 9sp 28t campy cassette and stack the cogs as i please, using the 8sp spacers?
    I believe the width of the cogs is narrower, so, you're likely gonna have trouble.
    "L'enfer, c'est les autres"

  5. #5
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    9 spd cogs are 0.15 mm thinner than 8-spd.

    so if your system was set up to shift perfectly in the middle of the cassette, by the end you would be 4 x 0.15 = 0.6 mm adrift.

    whether this would be noticeable, I don't really know.

    there used to be adapter spacers from Wheels Man. but not listed any more.

    There is also Miche who made a 8-spd 28 T cassette.
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  6. #6
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    Awesome, thanks everyone! You've all been super helpful and i appreciate it.

    I'll add some info since i've been reading about this.

    8sp splines are shallower than 9sp splines, so 8sp cogs won't mount on a 9sp freehub. The reverse should be fine. Miche sells individual cogs that are supposedly only for their cassettes, but i dunno if i buy that. Bikewagon sells them. Miche also makes an 8sp 13-28 cassette, but i can only find them at bike24, a german outfit.

    I found a 9sp 13-28 centaur cassette in my box of crap from my shop wrench days. No idea why i saved it, but it's loose cogs and in good shape. I'm gonna swap the top 2 cogs on to the mirage stack and c'est la vie if there's a gap in the spacing. I'll hold the spacers up to a belt sander for a moment if i have to, but i really doubt it will matter.


    I read that for a 8sp FD to clear a 26t the derailleur has do be modified with a dremel. Combined with my own experience running a 28 (on a 5500 crank), where every 100 miles or so the chain would get jammed between the chainrings and i'd 50% of the time shear it... i'm reluctant to go there. I haven't read any complaints about running a 28.


    Quote Originally Posted by JCavilia View Post

    As an old-timer, I am amused to hear early 90s Campy equipment described as "vintage." From your heading I figured we were going to be talking about 5-speed freewheels and friction shifters. ;-)
    hahaha this drivetrain is old enough to rent a car....

  7. #7
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    Don't see how you can use 9sp loose cogs on an 8sp freehub. I do know you could space the 9sp loose cogs as 8sp but on a 9sp freehub. For that you still may be able to find the Wheels MFG conversion kit on the auction site.

  8. #8
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    I still have the red spacers that you use with a Shimano cassette on a Shimano wheel, to make it compatible with campy 8 speed ergo.
    If your opinion differs from mine, ..........Too bad.
    .
    How would you like it if Hitler killed you
    Dogbert.

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    Buying parts to hang on your bike is always easier than getting fit.

    If you feel wimpy and weak, get out and train more, ya wee lassie!

    If Jesus had a gun, he'd be alive today!

  9. #9
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    Quote Originally Posted by MR_GRUMPY View Post
    I still have the red spacers that you use with a Shimano cassette on a Shimano wheel, to make it compatible with campy 8 speed ergo.
    I don't understand what you're referring to... shift cable spacer to change the cable pull ratio?

  10. #10
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    hahaha this drivetrain is old enough to rent a car....
    Barely old enough to rent a car is still a kid on my scale. Not hardly "vintage" in my mind ;-)

    The red spacers Mr. Grumpy mentioned were spacers between the cogs.
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  11. #11
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    Shimano 8 speed cassettes were loose cogs. If you replace the Shimano cog spacers with these special red spacers (from wheel's MFG), the Shimano wheel w/ shimano cassette will shift fine with Campy 8 speed shifters.
    If your opinion differs from mine, ..........Too bad.
    .
    How would you like it if Hitler killed you
    Dogbert.

    I>U

    Buying parts to hang on your bike is always easier than getting fit.

    If you feel wimpy and weak, get out and train more, ya wee lassie!

    If Jesus had a gun, he'd be alive today!

  12. #12
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    You won't be putting those 9sp loose cogs on an 8sp rear wheel regardless of spacers.

  13. #13
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    8sp splines are shallower than 9sp splines, so 8sp cogs won't mount on a 9sp freehub.
    You have the situation backwards.

    A new cog is looking for deeper splines than 8-speed had, and so it won't go on.

    An 8-speed cog will go on a modern freehub, but it's not a good idea as the engagement is half of what it should be.



    Now think if the situation was reversed.
    We just don’t realize the most significant moments of our lives when they’re happening
    Back then I thought “well there'll be other days”
    I didn’t realize that was the only day
    https://www.youtube.com/watch?v=Y9yrupye7B0

    There's sometimes a buggy.
    How many drivers does a buggy have?
    One.
    So let's just say I'm drivin' this buggy...
    and if you fix your attitude you can ride along with me.
    http://www.youtube.com/watch?v=GekiIMh4ZkM

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