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  1. #1
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    Dura Ace 8 spd cassette?

    Well, a bike equipped with full Dura Ace 7400 kinda fell into my lap. It has 8 spd indexed shifting, and the hub is compatible with the HyperGlide system. Is there anywhere you guys would recommend I start my search, outside of Ebay? Any other cassettes I can use? Anyone willing to sell one?

  2. #2
    @$#!?&!!$ junkfoodjunkie's Avatar
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    If it is Hyperglide any Shimano or 8 speed Sram Cassette will work. A WTB on your local craigslist could yield good results. Or here in the ISO thread

    Jake

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    Senior Member miamijim's Avatar
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    Any Shimano 8s HyperGlide cassette will work
    WWW.CYCLESPEUGEOT.COM 2005 Pinarello Dogma; 1991 Paramount PDG 70 Mtb; 1976? AD Vent Noir; 1989 LeMond Maillot Juane F&F; 1993? Basso GAP F&F; 1989 Terry Symmetry; 2003 Trek 4700 Mtb; 1983 Vitus 979

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    Caveat: You cannot exceed the rear derailleurs capacity, which I think is 26t (not sure, YMMV, etc).

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    What gearing are you searching for?

  7. #7
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    Thanks for all the replies.

    Quote Originally Posted by dvs cycles View Post
    What gearing are you searching for?
    DVS. I'm pretty open toward gearing, probably looking at a range close to 12-26.

  8. #8
    Senior Member RobbieTunes's Avatar
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    12-26 will be fine. Some of the real light ones don't wear as well, but there are lots of cassettes out there, new and used.

    Robbie ♪♫♪...☻

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  9. #9
    Senior Member liquefied's Avatar
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    SRAM 12-26 8 spd cassettes are super cheap at most LBS's.

  10. #10
    car dodger norskagent's Avatar
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    I run a shimano HG 12-26 8speed on my dura-ace paramount, it works great! Not my primary bike, but the set up (cassette and chain) is still going strong after several years.
    1989 Schwinn Paramount OS
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    "I've consulted my sources and I'm pretty sure your derailleur does not exist"

  11. #11
    Я люблю суп abarth's Avatar
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    I am running a Sram PG-850 cassette with my Dura Ace setup. It is inexpensive, shifts great, and pretty light weight for the price.

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    Я люблю суп abarth's Avatar
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    Quote Originally Posted by Chuckk View Post
    Not to forget that a "26 tooth capacity" rear derailleur is the total of the amount of tooth difference between the big and small sprockets front and rear.
    so a 12-26 uses 14 teeth of capacity. which would allow 12, or a 52-40 spread max on the front.

    Though some times it can be difficult to clear a big rear with the guiding jockey pulley of a short cage derailleur.

    What you described there is "Max Chain Wrap". The "Max Cog Capacity" for the 8 speed RD-7402 is 26 teeth. The Max Chain Wrap is also 26 teeth listed by Velobase. I have no problem running a 28 teeth max chain wrap with my RD-7402. It shifts very smooth and positive.

  13. #13
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    As much as I would like to keep the Dura Ace group consistent, would you guys recommend the SRAM PG-850 or the Shimano HG-50. Are there any differences, besides possibly weight?

  14. #14
    Senior Member miamijim's Avatar
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    HG50 is a good option.
    WWW.CYCLESPEUGEOT.COM 2005 Pinarello Dogma; 1991 Paramount PDG 70 Mtb; 1976? AD Vent Noir; 1989 LeMond Maillot Juane F&F; 1993? Basso GAP F&F; 1989 Terry Symmetry; 2003 Trek 4700 Mtb; 1983 Vitus 979

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    Quote Originally Posted by abarth View Post
    What you described there is "Max Chain Wrap". The "Max Cog Capacity" for the 8 speed RD-7402 is 26 teeth. The Max Chain Wrap is also 26 teeth listed by Velobase. I have no problem running a 28 teeth max chain wrap with my RD-7402. It shifts very smooth and positive.
    I ran a cassette with a 32 tooth large cog for a weekend tour with my 7402 drivetrain - everything worked well up to the 32. In the 32 the pulley wheel and the cog would rub together. I seem to remember everything was fine one gear down so you could possibly run a 28 if you so want some really low gears.
    Bikin' far-off places with the wife: http://peacocksride.wordpress.com

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    Я люблю суп abarth's Avatar
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    Quote Originally Posted by tashi View Post
    I ran a cassette with a 32 tooth large cog for a weekend tour with my 7402 drivetrain - everything worked well up to the 32. In the 32 the pulley wheel and the cog would rub together. I seem to remember everything was fine one gear down so you could possibly run a 28 if you so want some really low gears.
    Good to know. I wonder if you can shim under the b adjustment screw to make the 7402 works with 32 cogs. It will be cool to run 7402 on a mountain bike! What chain rings are you running up front?

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    That was with a 39/53 front ring combo. I'm not sure if the chainring size factors into the cog capacity issue. I tend to just try stuff first, then research if things don't work out

    Note I said should work. These cogs are way out of the range that the d is designed for, so it may take some mojo to get working.

    I think a 7402 on a mountain bike would be pretty hot, but there are two things I can think of to look out for: 1. 7402 requires 7402 shifters; you may be able to use Sheldon's "alternate cable routing" and normal 8-speed shifters. 2. You really don't have much chain wrap with a super short cage d and big cogs - I can't think of a fix for this, just be prepared for some difficulties.

    It sure would look good though, I love the strong, industrial looks of 7400 stuff. My fave by far.
    Bikin' far-off places with the wife: http://peacocksride.wordpress.com

  18. #18
    Я люблю суп abarth's Avatar
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    I know I was just kidding about the MTB. AFAIK, most Shimano short cage RD can handle up to 28t cog.

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