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Discussion Starter · #1 ·
Sorry if this question has been asked before, I searched but couldn't find any info....

I have an old pair of XTR m960 Crank/BB and I just purchased a new set of XT M770 cranks/BB.

My questions:

1) they are both hollowtech II so I can use either BB with the new XT cranks right?

2) There is nothing wrong with the XTR BB currently installed. Should I leave it and replace it with the new XT when it fails (assuming the answer to question 1 is yes) or should I replace with the new XT. I figure the old XTR is still a tiny bit lighter? What would you do?

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