NX Eagle Groupset - 165, 170 or 175mm?- Mtbr.com
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  1. #1
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    NX Eagle Groupset - 165, 170 or 175mm?

    Upgrading my Trek with the NX Eagle groupset (have all the tools, install is no problem). But how do you decide the crank length? Is 175 for more speed if you race, 165 for more clearance on trails, and 170 a happy medium? Is there a specific length you would cross off first, if you had to decide between only two sizes? Note that I'm an older clyde who enjoys MTB but by no means am I shredding the desert floor here in AZ, lol. I'm OK with "a little easier" at the cost of performance. Thanks all.

  2. #2
    No good in rock gardens..
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    Some bikes run 170mm on small sizes and 175 on M and up.

    If your bike has a low bottom bracket and you're often whacking pedals in rocky terrain, running slightly shorter cranks can add a little clearance but it's not much.

    Unless you're short I'd say go with 175mm.

    I'm running NX 12 on a Merida One Twenty Nine 29er dually and I'm very happy with the 175mm cranks on my size M.
    Less isn't MOAR

  3. #3
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    Good job! Perfect!

    Quote Originally Posted by Sideknob View Post
    Some bikes run 170mm on small sizes and 175 on M and up.

    If your bike has a low bottom bracket and you're often whacking pedals in rocky terrain, running slightly shorter cranks can add a little clearance but it's not much.

    Unless you're short I'd say go with 175mm.

    I'm running NX 12 on a Merida One Twenty Nine 29er dually and I'm very happy with the 175mm cranks on my size M.
    Exactly what I needed to know. Thanks!

  4. #4
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    And I finally found the specs on my Shimano granny gear stock 3-ring crankset, and it's 175mm. Mystery solved!

  5. #5
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    my inseam measures actually 33 inches (I am 5'11"). I have 170mm cranks on my full suspension and my gravel bike. I have 175 on my hardtail. I notice exactly 0 difference.

    I would probably get 170s again because I like that little bit of extra pedal clearance.

  6. #6
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    Unless you're very tall, go with 170 or 165. Trust me on this.
    Last edited by Lone Rager; 06-18-2020 at 09:07 AM.
    What, me worry?

  7. #7
    jrm
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    I run the truvativ descends in 17o. I feel like im less likely to roll my hips side to side when im tired and the shorter stroke means i can put more into the down stroke. I haven't noticed that being shorter they make spinning up harder. I still whack stuff regardless..

  8. #8
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    ALL great answers, thanks! I wasn't totally sure how significant the 5mm difference would be, and it sounds like it may or may not, BUT, I'll go with the 170mm. Middle choice won't be the risky one, lol. I'm 5'11' w/32" inseam, average height so average crank size.

    Thanks!

  9. #9
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    I'm the same measurements, no reason not to go 165.
    Ripley LS v3
    OG Ripley v2 handed down to son

  10. #10
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    Quote Originally Posted by TwoTone View Post
    I'm the same measurements, no reason not to go 165.
    Turns out that 170 is out of stock in several places. If 165 is in stock then Iíll do that. Iím not thinking I donít want my knees to go that high anyway since Iím getting old. Itís only 10mm but Every little bit helps. 😀

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