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Change / replace derailleur on a CX bike.

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  • April 1, 2019 at 5:24 pm #29493
    Huckfinn

    Hi,
    I have a cyclocross bike with a Rotor 3DF, 36/46 Crankset and a SRAM XG1190 11×28 cassette.
    I’d like to swap the cassette for an 11-40 or 11-42.

    The guys at Wolftooth said: “..derailleur does NOT have enough capacity to handle an 11-40 cassette and a double chainring. You will have to be careful to not use small/small and large/large gearing combinations..”

    So:can I simply buy a new derailleur, long cage (ex: Sram Unisex’s Nx 1×11 Speed Long Cage Rear Derailleur-Red, Medium).

    Thanks for any feedback!!

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  • April 2, 2019 at 5:10 pm #938567
    0
    Jimthebikeguy.com

    You are tying yourself in
    You are tying yourself in knots here. Do you need to keep your front mech? If not, then get a long cage rival 1 /apex 1 rear mech, and an 11-42 cassette. Then get a chainring of your choice, prb a 42 or 44, narrow wide. I am assuming you have an 11spd system, its hard to tell.

    April 2, 2019 at 3:49 pm #938565
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    fukawitribe
    Huckfinn wrote:
     Or a very simple super-compact AbsoluteBlack 46/30 + 11-30 cassette?

    I’d have an AbsoluteBlack 46/30 oval in a heart-beat – lovely bit of kit. Not sure of the RD and the 30T (or 32T) – might work as-is or with the old gag of B-tension screw backwards or might need a longer cage, not sure, not played with SRAM stuff so couldn’t comment. With Shimano, plenty of folk have run 30/32T on a short cage so you may well be fine. Hit Google and YouTube for that I reckon

    April 2, 2019 at 3:32 pm #938563
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    Huckfinn

    AbsoluteBlack 46/30?

     Or a very simple super-compact AbsoluteBlack 46/30 + 11-30 cassette?

     

    April 2, 2019 at 3:10 pm #938561
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    Huckfinn

    I have a small cage but…

    I have a small cage but….where does that leave me?

     

    April 2, 2019 at 3:06 pm #938559
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    fukawitribe

    Depending on what rear mech

    Depending on what rear mech you already have, i’d doubt that you’d need a RoadLink with an 11-34T – more likely a tweak with the B-tension screw if anything. WiFli should work fine, worth checking here and elsewhere with folk that have done exactly that – i’ve been running 11-34 with a Shimano medium cage (GS) RD-6800 for over a year now, works brilliantly, didn’t even need to adjust the B-tension screw.

    April 2, 2019 at 2:48 pm #938557
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    Huckfinn

    Ok; what if I just do this: 

    Ok; what if I just do this: 

    1-Get smaller chainring (33 t). I’d have a 46-33 Crankset

    2-Roadlink

    3-11-34 cassette.

    Would it work? I’d be happy climbing Turini or Madone with it if it did…:-)))

     

    April 2, 2019 at 2:41 pm #938555
    0
    fukawitribe
    Huckfinn wrote:
    Gosh!

    So this would not be good?:

    That’s an X-Actuation mech, so I would guess that it’s not going to play nicely with an Exact Actuation shifter.

    https://www.sram.com/sram/mountain/products/nx-1×11-x-horizon-rear-derailleur#specs

    April 2, 2019 at 2:14 pm #938553
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    Huckfinn

    Gosh!

    Gosh!

    So this would not be good?:

    April 2, 2019 at 11:59 am #938551
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    fukawitribe
    kil0ran wrote:
    SRAM derailleurs should be interchangeable – they all use the same pull I believe (SRAM call it Exact Actuation)

    OP might need to be careful choosing the RD – i’d looked at this before and it’s not as simple as I thought. Seems to be that SRAM 10 and 11-speed road RD/shifter is compatible with 10-speed MTB, but not 1x 11-speed. The first lot is Exact Actuation (1.3:1) and the second X-Actuation (1.12:1). From a MTBR forum post I had

    https://forums.mtbr.com/sram/x-actuation-exact-actuation-938188.html wrote:
    Exact Actuation (Road 10 & 11sp, Mtn 10sp) is 3.1mm while X Actuation (Mtn 11sp) is 3.48mm
     

     

    All a bit confusing IMO….

    April 2, 2019 at 11:34 am #938549
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    kil0ran

    SRAM derailleurs should be

    SRAM derailleurs should be interchangeable – they all use the same pull I believe (SRAM call it Exact Actuation)

    So just stick one of their large capacity derailleurs in and you should be good to go. You’ll also need a new chain

     

    April 2, 2019 at 10:51 am #938547
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    Huckfinn

    Thanks!!

    Thanks!!

    But: can I just get a new derailleur and cassette to make this work the way i want? Aren’t the components designed as part of a system with parts that are designed to work together? Like a rear derailleur that matches my SRAM Red shift levers?

    Because, as an alternative: swap the 36 for a 30 (46-30 should be fine, don’t you think?) + 11-32 cassette….

    What do you think?

    April 1, 2019 at 9:04 pm #938545
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    CXR94Di2

    Yes. you might need a new
    Yes. you might need a new longer chain

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