I've just bought a Black & White 2013 Niner Jet 9 RDO.
It came with a M785 XT Crank.
I've decided to buy a XTR M985 40/28 crank and I did.
Only after the purchased I saw in the following link on the Niner website (http://www.ninerbikes.com/jet9rdo):
"Shimano XTR recommended 2X chainrings: 26/38T. We do not recommend the use of 40T (48.8mm chain line) cranks because the large chainring may contact the frame".
Now what exactly does that mean?
1. Can I use the M985 with 28/40?
2. If not, can I just replace the 40T chainring with 38T one?
3. Is there a M985 38T chainring?
4. If not, do I need to replace both chainrings or replace the crank to M980 altogether?
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