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  1. #1
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    switching from 28/42 to 26/39, which derailleur S2 or S3?

    I've got a '11 scalpel ultimate, need to change out the direct mount XX to accommodate the 26/39. Stock is 28/42 with an S3 XX. What is the difference between the S2 and S3? Thanks

  2. #2
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    S2 mounts are 22.7mm and S3 are mounts are 22.1mm. So they aren't interchangeable. You just need the XX S3 for the 26/39.

  3. #3
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    thanks

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