FS: SRAM NX Eagle 1x12 5-piece Groupset, Brand New

[smmokan]

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 (this uses the Shimano hub driver, not XD)
- SRAM NX 12-speed chain

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

[stuckathuntermtn]

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?

[smmokan]

Not noticeably. It’s just a compromise between pedaling and minimizing pedal strikes, for the most part.


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[smmokan]

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

[EWG]

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...

[SchralphMacchio]

You’d need to have a relatively new free hub though, because that cassette requires an XD Driver compatible freehub body.

[doebedoe]

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.

[Dantheman]

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.

[SchralphMacchio]

170 also generally better if you are under 5’ 10”

[doebedoe]

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/

[Dantheman]

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

[smmokan]

Updated listing to show that this uses a Shimano hub driver, not XD.

[Dee Hubbs]

615 gram cassette....