how to fit 36t or larger chainring on 2015 niner air 9 RDO?

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how to fit 36t or larger chainring on 2015 niner air 9 RDO?
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Posted: Jan 29, 2020 at 12:05 Quote
I was naively thinking I could easily convert my 2015 Niner Air9 RDO into a gravel bike by swapping the 32t front chainring for a 40t.

Then I realized that Niner doesn't recommend anything larger than 32t in front.

Is there a way around this, by using an offset chainring to get to a 36t or 38t?

Here is what I have to work with:

non-boost spacing - 49 mm chainline
sram XX1 cranks with bb30
it looks like a direct mount chainring
68 Q-factor
appparently short spindle

wolf suggested an offset chainring, but i am not sure how much space that would buy me. also I am not sure how this would affect shifting.

any insight would be much appreciated!

Posted: Feb 12, 2020 at 11:21 Quote
jensnorman wrote:
I was naively thinking I could easily convert my 2015 Niner Air9 RDO into a gravel bike by swapping the 32t front chainring for a 40t.

Then I realized that Niner doesn't recommend anything larger than 32t in front.

Is there a way around this, by using an offset chainring to get to a 36t or 38t?

Here is what I have to work with:

non-boost spacing - 49 mm chainline
sram XX1 cranks with bb30
it looks like a direct mount chainring
68 Q-factor
appparently short spindle

wolf suggested an offset chainring, but i am not sure how much space that would buy me. also I am not sure how this would affect shifting.

any insight would be much appreciated!

You may be able to cheat the clearance by using an Ecentric BB which would move the bottom bracket forward and away from the stays. I've done this with 38T chainrings, but not on a 2015.


 
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