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Old 07-10-10, 06:22 PM   #1
pinoy92231
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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.
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Old 07-10-10, 06:41 PM   #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.
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Old 07-10-10, 08:39 PM   #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.
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Old 07-10-10, 08:58 PM   #4
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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.
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Old 07-10-10, 09:16 PM   #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.
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Old 07-10-10, 11:07 PM   #6
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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
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Old 07-11-10, 04:35 AM   #7
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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).
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Old 07-11-10, 04:40 AM   #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.
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Old 07-11-10, 04:42 AM   #9
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but you will notice better shifting with a shorter chain.
About as much as you'll notice a smoother ride from a carbon seatpost.
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Old 07-11-10, 06:23 AM   #10
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So, add the 1.1 mm spacer along with the Mavic spacer?
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Old 07-11-10, 10:46 AM   #11
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Yes, use the ~1mm spacer included with the cassette in addition to the Mavic spacer.
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