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  1. #1
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    Swapping from 12-27 to 11-23

    I've searched and searched and can't seem to get an answer to my questions.

    I just ordered an Ultegra 11-23 10spd cassette to swap out my 105 12-27 10spd cassette. The wheels I'm using is a newer (08 to 2010) Mavic Kysrium Elites and I have a compact 105 crank.

    -What size spacers do I need to make this work?

    -Do I need to take out some links on my chain?

    -Do I need to make any adjustments to my RD?

    Thanks.

  2. #2
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    Keep exactly the same spacers the 12x27 now has as the 11x23 will need identical ones. I'm not sure what Mavic requires and Shimano provides a 1 mm thick spacer that goes behing their 10-speed cassettes when used on their 8/9/10-speed hubs. Anyway, keep what is already there in the same positions and order.

    Going from a 27 to 23T big cog will let you remove 1/2 of the tooth difference of 4 teeth or 2 "half links" (i.e. 1") of chain.

    You may need to make very minor limit screw and/or cable tension tweaks if the new cassette doesn't line up exactly with the old one. Try it with no adjustments first. Often none are needed.

  3. #3
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    As HillRider noted, you could remove links from your chain but you do not have to remove any links. Your small/small combo is only being reduced by one tooth so unless your chain was sized right at the limit of being too long, it won't be too long now.

  4. #4
    cab horn
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    27 to 23 will require a chain length drop, if your original chain was sized properly. R.D b-tension will also need to be readjusted, again assuming it was set properly.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  5. #5
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    Thanks for the help guys. When I took the cassette from my Mavics, there was a 2-3 mm spacer with cutouts that only fit one way. I installed the cassette both ways with and without this spacer and the play was eliminated with the spacer installed. Do you guys think I will still need to use the 1 mm spacer with that came with the 6700 Ultegra cassette.

  6. #6
    cab horn
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    Quote Originally Posted by pinoy92231 View Post
    Thanks for the help guys. When I took the cassette from my Mavics, there was a 2-3 mm spacer with cutouts that only fit one way. I installed the cassette both ways with and without this spacer and the play was eliminated with the spacer installed. Do you guys think I will still need to use the 1 mm spacer with that came with the 6700 Ultegra cassette.
    That 1.1mm spacer is optional. The mavic spacer, is critical
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  7. #7
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    Quote Originally Posted by operator View Post
    That 1.1mm spacer is optional.
    Since when?

    I also, again, disagree about shortening the chain. A chain with a few extra links isn't going to hurt anything. If the OP ever decides to swap back to the 12/27 cassette, they'll need to add links back to their chain (PITA) in order to use the bigger cassette. They gain nothing by shortening the chain (maybe a few grams).

  8. #8
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    Yes the Mavic spacer is mandatory.

    Keeping two chains with SRAM quick link makes life easier for swaps.

    You don't necessarily need a shorter chain, but you will notice better shifting with a shorter chain.

  9. #9
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    Quote Originally Posted by valrulez View Post
    but you will notice better shifting with a shorter chain.
    About as much as you'll notice a smoother ride from a carbon seatpost.

  10. #10
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    So, add the 1.1 mm spacer along with the Mavic spacer?

  11. #11
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    Yes, use the ~1mm spacer included with the cassette in addition to the Mavic spacer.

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