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  1. #1
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    Shimano vs SRAM cassette?

    So, I'm running a Shimano Ultegra 27-12 cassette, 10 speed, at the moment. In a year or so, it will likely be due for a change. So, I'm starting to watch for price sales, and will buy a replacement when the price is right.

    I really like this cassette. The ratios really match my riding style and the terrain of my local riding routes.

    But, it seems Shimano has stopped making the 27-12. It's nearly impossible to find in the US. So....all I'm finding is the few and far between SRAM version. They are supposed to be interchangeable, but.... Are they really? I mean, does the SRAM shift as clean inlay and smoothly and crisply(?) as Shimano Ultegra?

    Should I buy SRAM, Or, should I just switch to the 28-11 Shimano, and maybe? have to adjust chain length?

    Not trying to start a component war, just looking for thoughts from those who have used both SRAM and Shimano.
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  2. #2
    'brifter' is a lame word.
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    SRAM and Shimano are definitely interchangeable. Exact same spacing. Slightly different cog shapes and profiles but no big deal. If you like the 12-27 (yes, you use the small cog first) then stick with it. If you change to 28 you won't have to change your chain length.
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  3. #3
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    Quote Originally Posted by Doug B View Post
    Are they really? I mean, does the SRAM shift as clean inlay and smoothly and crisply(?) as Shimano Ultegra?
    Yes and yes.

    My question was different than yours but FYI on the same switch: Sram 10 speed cassette PG 1070

  4. #4
    tlg
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    Quote Originally Posted by Doug B View Post
    Should I buy SRAM, Or, should I just switch to the 28-11 Shimano, and maybe? have to adjust chain length?
    Use what you want. They're 100% compatible. You won't know the difference.
    Unless your chain was really sized wrong, should be no problem going to 28.

    One thing to note the Shimano cassette will come with a 1mm spacer. You need to use it.
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  5. #5
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    Thanks folks. I think I'll try the SRAM and stay with the same ratio.
    To those in uniform, both present and past, who have protected my freedoms, I thank you. I've had a good life so far.

  6. #6
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    Quote Originally Posted by Doug B View Post
    Thanks folks. I think I'll try the SRAM and stay with the same ratio.
    If you go with SRAM and using an 11 speed wheel you do NOT need that little spacer that Shimano includes with their 10 speed cassettes. You still need the bigger one that comes with the wheel.

  7. #7
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    Why does Shimano use that thin spacer behind the cassette? Curious that if you use one of their mountain cassettes, you don't use a spacer. SRAM doesn't use one either.

  8. #8
    tlg
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    Quote Originally Posted by mfdemicco View Post
    Why does Shimano use that thin spacer behind the cassette?
    Their cassette is 1mm thinner.
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  9. #9
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    Shimano vs SRAM cassette?

    Quote Originally Posted by tlg View Post
    Their cassette is 1mm thinner.
    I know that. They should make the cassette 1mm thicker for compatability.

  10. #10
    tlg
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    Quote Originally Posted by mfdemicco View Post
    I know that. They should make the cassette 1mm thicker for compatability.
    There is no compatibility issue.

    When 10sp came out, Shimano developed a thinner 10sp specific freehub. Which flopped. But that's "why" they are thinner.
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