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  1. #1
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    Increase rotor size Scalpel Si carbon 2

    I want to increase the Shimano rotor from 160mm to 180 or better 203mm size. But i cannot find the right solution with the brake adapter. I already checked the Cannondale documentation, but this is not clear to me.
    My bike is a 2017 Scalpel carbon 2 with Lefty 2.0. On this bike the both rotors are 160mm. The original brake adapter installed, is the KH111. I want to increase the front rotor to 180 or 203mm. Has any one has solved this issue? I think the use of ordinairy spacers js not so idea....

  2. #2
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  3. #3
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    Looks like it should be KH130 from the Dr. Cannondale website:

    Adapter Lefty 36 27.5 ; 2.0 29er SuperMax Hub, 180mm Disc

    I can check for sure on my SI-5 when I get it back from the shop...

    But as I read it,
    Supermax Hub: KH111 > KH130
    Standard Hub: KH112 > KH131
    --------------

    [WTB] 1987 Cannondale SM800, 20", Pink with airbrushed graphics.

  4. #4
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    Quote Originally Posted by Roys View Post
    pretty simple...any 180 or 203mm PM brake adapter will work..I did it to my Scalpel Si to fit 180mm rotors

    Increase rotor size Scalpel Si carbon 2-img_5258.jpg

  5. #5
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    Quote Originally Posted by guidodg View Post
    pretty simple...any 180 or 203mm PM brake adapter will work..I did it to my Scalpel Si to fit 180mm rotors

    Click image for larger version. 

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    I am gonna try this. Same solution, adapter from 160mm to 203mm.

    Thank you for the reply. These adapters are not easy to find, i ordered this one in France.

    Increase rotor size Scalpel Si carbon 2-ash0050.jpg

  6. #6
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    Last edited by J_Westy; 01-15-2018 at 05:13 AM.
    --------------

    [WTB] 1987 Cannondale SM800, 20", Pink with airbrushed graphics.

  7. #7
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    Quote Originally Posted by J_Westy View Post
    Looks like it should be KH130 from the Dr. Cannondale website:

    Adapter Lefty 36 27.5 ; 2.0 29er SuperMax Hub, 180mm Disc

    I can check for sure on my SI-5 when I get it back from the shop...

    But as I read it,
    Supermax Hub: KH111 > KH130
    Standard Hub: KH112 > KH131
    I forgot to circle back... my Si5 actually uses a shimano adapter to get to 180mm on what I assume is a KH111 (but I don't see it marked anywhere)

    Shimano Mount Adaptor Front Post to Post | Chain Reaction Cycles
    --------------

    [WTB] 1987 Cannondale SM800, 20", Pink with airbrushed graphics.

  8. #8
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    Those adapters are like the easiest thing to find. Any bike shop could order you any size adapter from 4 or 5 different brands. And any cannondale shop could have got you the 180mm mount for the lefty 2.0. Why do you want 203 rotors on a scalpel si ?

  9. #9
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    Quote Originally Posted by scooterman View Post
    Why do you want 203 rotors on a scalpel si ?
    My first though upon reading this thread. Not that OP really needs a reason to do whatever they want, but it seems like overkill for a bike that is capable of running a 140 rotor on the rear...

  10. #10
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    I find it perfect running a 180 front and 160 rear...203 would be overkill also in my opinion..

  11. #11
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    Quote Originally Posted by scooterman View Post
    Those adapters are like the easiest thing to find. Any bike shop could order you any size adapter from 4 or 5 different brands. And any cannondale shop could have got you the 180mm mount for the lefty 2.0. Why do you want 203 rotors on a scalpel si ?
    To be honest, it's stil a bit confusing...

    This the table from the manual:

    Increase rotor size Scalpel Si carbon 2-leftybrakeadapter.jpg

    So does one of these work directly with a 180mm rotor on a 2.0 with 55mm offset.

    Or do you always need an adapter?

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    [WTB] 1987 Cannondale SM800, 20", Pink with airbrushed graphics.

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