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  1. #1
    Join Date
    Apr 2004
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    Three-O-Three
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    FS: SRAM NX Eagle 1x12 5-piece Groupset, Brand New

    Selling a brand new 5-piece 2019 SRAM NX Eagle 1x12 groupset. All parts are new and have never been installed (or even taken out of the plastic):

    - SRAM NX Crankset DUB Spindle, 170mm w/ 30t chainring
    - SRAM NX Shifter
    - SRAM NX Derailleur
    - SRAM NX Cassette, 11-50
    - SRAM NX 12-speed chain

    $325, includes shipping within the US. PM if interested.

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  2. #2
    Join Date
    Mar 2006
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    Missoula, MT
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    19,662
    Seems like a damn good deal to convert to 1x, but what is the deal with 170mm cranks? I see that spec'd a lot more lately. Doesn't it make pedalling harder?

  3. #3
    Join Date
    Apr 2004
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    Three-O-Three
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    Not noticeably. It’s just a compromise between pedaling and minimizing pedal strikes, for the most part.


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  4. #4
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    Apr 2004
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    FYI, the NX cassette fits onto a regular 8/9/10/11 speed (Shimano) hub driver, NOT the XD driver.

  5. #5
    Join Date
    Sep 2018
    Posts
    350
    Tempting. Would be nice to convert one of my kids' bikes to 12 speed from old school triple xtr.

    Not sure which way I'll fall on the tempt-o-meter...

  6. #6
    Join Date
    Mar 2007
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    Eugenio Oregón
    Posts
    6,958
    You’d need to have a relatively new free hub though, because that cassette requires an XD Driver compatible freehub body.
    _______________________________________________
    "Strapping myself to a sitski built with 30lb of metal and fibreglass then trying to water ski in it sounds like a stupid idea to me.

    I'll be there."
    ... Andy Campbell

  7. #7
    Join Date
    Jan 2014
    Location
    Gaperville, CO
    Posts
    3,265
    Quote Originally Posted by SchralphMacchio View Post
    You’d need to have a relatively new free hub though, because that cassette requires an XD Driver compatible freehub body.
    NX takes the regular spline, not the XD Driver. Just like smmokan said.

  8. #8
    Join Date
    Oct 2003
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    slc
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    9,671
    Quote Originally Posted by stuckathuntermtn View Post
    Seems like a damn good deal to convert to 1x, but what is the deal with 170mm cranks? I see that spec'd a lot more lately. Doesn't it make pedalling harder?
    There's quite a bit of research out there showing that the reduced leverage is offset by improved biomechanics from the reduction in knee flexion. Most of the research has been on the roadie side of things though. Short cranks (sometimes really short, like 135 mm) have gotten really popular with triathletes. For MTB it's more of a gray area I think, but at worst 170 vs 175 probably doesn't make pedaling appreciably harder (especially for short people) and will certainly save some pedal strikes on a low-BB bike.

  9. #9
    Join Date
    Mar 2007
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    Eugenio Oregón
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    6,958
    170 also generally better if you are under 5’ 10”
    _______________________________________________
    "Strapping myself to a sitski built with 30lb of metal and fibreglass then trying to water ski in it sounds like a stupid idea to me.

    I'll be there."
    ... Andy Campbell

  10. #10
    Join Date
    Jan 2014
    Location
    Gaperville, CO
    Posts
    3,265
    Quote Originally Posted by Dantheman View Post
    There's quite a bit of research out there showing that the reduced leverage is offset by improved biomechanics from the reduction in knee flexion. Most of the research has been on the roadie side of things though. Short cranks (sometimes really short, like 135 mm) have gotten really popular with triathletes. For MTB it's more of a gray area I think, but at worst 170 vs 175 probably doesn't make pedaling appreciably harder (especially for short people) and will certainly save some pedal strikes on a low-BB bike.
    I knew a dude in MPLS that did a whole lot of modification to super short cranks for Tri folks. Coolest bike tinkerer I've ever met. http://bikesmithdesign.com/

  11. #11
    Join Date
    Oct 2003
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    slc
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    9,671
    Quote Originally Posted by doebedoe View Post
    I knew a dude in MPLS that did a whole lot of modification to super short cranks for Tri folks. Coolest bike tinkerer I've ever met. http://bikesmithdesign.com/
    Yeah, I found that guy when I got into researching kids bikes. He has a lot of info regarding short cranks on his site that isn't directly linked to from the homepage:

    http://bikesmithdesign.com/Short_Cranks/index.html
    http://bikesmithdesign.com/Short_Cra...and-power.html
    http://bikesmithdesign.com/Short_Cra...anks4kids.html

    He's not alone, either. Optimum length seems to be about 10% of height: https://bikedynamics.co.uk/FitGuidecranks.htm

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