I plan on going 2x9 on my 29er using a XTR m952 crank standard 110/74. Plan on using a 26or28/38 setup to start. Since teh crank is XTR I have to use Octalink V1. Standard BB spindle is 112.5 but 116mm is available. However I could use a DuraAce or Ultegra or 105 to get a 109.5.
My questions are:
1. Is it preferred to run rings on the inner and middle over middle/outer in a 2X9?
2. If so, assume I spend most time in the inner (26 or 28, or maybe 30) do I have to accommodate for that by adjusting the crank outward (by the BB spindle length)?
3. If 112.5mm is not the best option can I used a Shimano road BB. I'm not asking if it will work. But how well will it work. Will dirt and mud kill them?
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