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  1. #1
    mtbr member
    Join Date
    Apr 2007

    Shimano M8000 XT cranks, why go to 96bcd? I have a theory....

    I need some new cranks to replace my 2013ish SLXs I currently run. They're getting moved to another bike.

    I run a 1x setup with an MRP AMG V2, which I love. On my SLX cranks (104bcd), I have a Wolftooth Dropstop 30t. It works great, but because of the 104bcd, my MRP can't drop over the ring. It hits the tabs. So currently, it's really not providing any chain security on top, just kind of riding along the top of the ring.

    Is one of the reasons Shimano went to 96bcd on the M8000 cranks for an issue similar to this? The need for running 28-30t single rings? I am wondering if I should go to the new XTs or switch entirely to something direct mount to avoid this issue. Whatever I get, I need to be sure I can set up a guide properly and not hit the tabs of a 104bcd crank.


  2. #2
    mtbr member
    Join Date
    Jan 2004
    My guess is the biggest reason Shimano went 96bcd is to "encourage" you to buy their chainrings. Sure, you can get 96 bcd rings from other companies, but they are harder and usually more expensive than the more common 104bcd.

    Another reason was probably was to allow smaller chainrings to fit the cranks, 104 bcd being limited to 30t or larger.

  3. #3
    mtbr member
    Join Date
    Apr 2007
    ^^^ Yep I had similar thoughts especially when I saw some SRAM setups are 94bcd! Ha.

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