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I have a dub crankset with arm length 175 (https://www.sram.com/en/truvativ/models/fc-styl-7k-b1)

I want to change the crank arm length to 167.5

There's no 167.5 crank arm for SRAM MTB line (I think SX/NX/GX/XX1/X01 are MTBs?)

I found Red and Force 167.5 arms which are also DUB (I think these Red and Force are for road?)

So can I mix the Red or Force crank arm (https://www.amazon.com/SRAM-Force-AXS-Crank-Assembly/dp/B07WCRY3BY) with my existing MTB crankset ?

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  • Is there a reason you are set on 167.5mm instead of 165mm or 170mm? A 2.5mm difference is likely smaller than most people can notice. It seems likely that either of these common crank lengths would be OK for you.
    – Weiwen Ng
    Dec 22 '20 at 18:08
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Road cranks are not going to work on your MTB.

The crank arms include the crank axle - one of the arms is permanently attached to the axle. The axle length is important. Road bikes use narrower bottom bracket shells than MTBs and hence have shorter axles.

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  • Thank you...! might require a new question but.. would lightningbikes.com/store/index.html#!/Lightning-MTB-cranks/p/… this work for me? they have osbb (specialized) listed.. but don't say dub.. does that mean, I'll have to buy osbb bottom bracket as well to use the crankset?
    – eugene
    Dec 22 '20 at 15:12
  • Personally I would not touch a carbon crank from a manufacturer I have never heard of. What you should do at this point is learn a bit more about bottom bracket standards so you wont have to keep asking if certain cranks fit your bike. Start here and here. Dec 22 '20 at 15:50
  • Also make sure you understand chain-line. That's the distance from the center line of the chainrings to the center line of the frame. Different drivetrain setups require different crank chain-lines. This is related to the width of the rear hub and how far outboard the cassette is positioned. Dec 22 '20 at 16:04
  • I tried reading that article about bottom bracket. just so overwhealming.. I guess i'll give it another try.. Thank you.
    – eugene
    Dec 22 '20 at 16:07
  • @eugene Reading the crank specifications, they don't say what axle diameter they use. DUB refers to the crank axle diameter (28.99mm). Now, I have heard of Lightning during my weight weenie days, and I know these cranks predate the introduction of DUB. So, if you decide to get them, assume you will need to change your BB.
    – Weiwen Ng
    Dec 22 '20 at 18:06

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