2016 Air 9 RDO - how to make 40t fit? BB30 / sram xx1- Mtbr.com
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  1. #1
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    2016 Air 9 RDO - how to make 40t fit? BB30 / sram xx1

    Hey gang,

    I am turning my Air 9 RDO into a "gravel bike" and need to swap my 32 chainring for a 40t. I just realized there isn't really room for even a 34. Is there a way around this?

    stats:
    175mm
    68 Q-factor
    non-boost
    11 spd
    sram xx1
    49 mm chainline

    Has anyone encountered this before or have suggestions? would love to avoid buying another bike..

  2. #2
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    If this a non-boost frame? If so you could try a SRAM direct mount Boost chainring which would add another 3mm of clearance to the chainstay area. SRAMís largest Boost chainring size is 38T.

  3. #3
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    Quote Originally Posted by RacerLex View Post
    If this a non-boost frame? If so you could try a SRAM direct mount Boost chainring which would add another 3mm of clearance to the chainstay area. SRAMís largest Boost chainring size is 38T.
    Correct, this is a non-boost frame.

    any guess as to how this would affect shifting?
    and any guess as to how much space this could buy me?

    thank you!

  4. #4
    West Chester, PA
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    Quote Originally Posted by jensnorman View Post
    Correct, this is a non-boost frame.

    any guess as to how this would affect shifting?
    and any guess as to how much space this could buy me?

    thank you!
    Not enough. If a 34 touches you could fit it by switching to a boost ring, but it's not nearly enough offset for a 38 to work. You're going to have to go with a smaller cassette.

  5. #5
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    You sure it's a BB30 frame and not a PF30? If it's a PF30 you may be able to use Niner's Biocentric30 bottom bracket and adjust it so it centers furthest away from the chainstay. This may get you an additional 8mm of spacing.

    Verify with Niner support your Air9RDO has a bottom bracket shell will support their Biocentric30. You risk cracking the shell if it's not designed for it.

  6. #6
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    Quote Originally Posted by RacerLex View Post
    You sure it's a BB30 frame and not a PF30? If it's a PF30 you may be able to use Niner's Biocentric30 bottom bracket and adjust it so it centers furthest away from the chainstay. This may get you an additional 8mm of spacing.

    Verify with Niner support your Air9RDO has a bottom bracket shell will support their Biocentric30. You risk cracking the shell if it's not designed for it.
    Thank you so much for pointing this out. I looked into the Niner archives and it looks like I do in fact have a PF30 BB. Sadly the Niner I have is not compatible with the Biocentric bottom bracket.. but I now have some options to go bigger than 32t, according to Wolf tooth components, as I do not have a BB30!

    Thanks again.

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