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  1. #1
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    Reputation: andresco50's Avatar
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    Apr 2012

    Q factor issue in XTR to XX1 swap!! on a stumpjumper ht 2013

    Hello guys I really want the XX1 group!!! But I am really confused with this Q factor measure I read the PDF frame fit document from SRAM but can't see anything helpful

    Did some research and some people said 166 q factor and others 168 q factor and other the WIDEST ONE!!

    Which is the correct q factor for my S-WORKS STUMPJUMPER HT 2013??!!

    please help!!

  2. #2
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    Reputation: Mr. Lynch's Avatar
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    Jun 2010
    There is a 156q factor and a 168q factor. I went with the 168q since I have a Stumpjumper FSR and you need the extra width the clear the stays. The 168q will pretty much fit any bike, while the 156q generally only fits hardtails.

    You can go either way for your SJ hardtail. I've thought about putting XX1 on my HT 29er and I'd probably stick with 168q because the wider setup is more comfortable to me, but 156q fits fine (2011 RH Pro).
    14 Aurum, 16 Fuse, 17 T130

  3. #3
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    Feb 2012
    Sram just offer wide or narrow. The confusion on the 166 vs 168 is just some websites printing the wrong number. I noticed that when I was looking around for an XX1 crank.

    I recently put XX1 on my 2010 Epic. I measured the q-factor and it looked like the narrow would fit and then I realised the heal of my shoe would have been hitting the chain stays, so went with the wide. If measuring yourself remember to factor in where your heel will be.

    The wide (166/168) will definitely fit. The s-works cranks are 166.5 which is what comes on the s-works SJ HT, so might be worth sticking with the wide? If you have the s-works cranks you should check with your LBS to see if the spider for XX1 is available yet. It might save you a few $.

  4. #4
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    Jan 2010
    As i already wrote in your built thread - both will work, i took the measurents according to the official sram xx1 frame fit specifications document. If you choose the narrow crank (Q156) you will have about 4-5 mm space between crankarm and chainstay. Pretty close. If you choose the q166 version you will have about 10 mm on each side between crankarm and chainstay. This should be more reliable.

  5. #5
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    Reputation: andresco50's Avatar
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    Apr 2012
    Yeah finally i will go with the 168 q factor crankset hope works well in all gears

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