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  1. #1
    mtbr member
    Join Date
    Feb 2006

    Alfine : Whats this black plastic disk?

    Making build sheet for new bike.

    Was wondering why some Alfines have this black plastic ring and some don't.
    Obviously, looks better without it.

    Why some without it?

    Attached Thumbnails Attached Thumbnails Alfine : Whats this black plastic disk?-sprocket-guard.jpg  

  2. #2
    mtbr member
    Reputation: vikb's Avatar
    Join Date
    Sep 2008
    Chain guard....none of mine have it and I've never missed it.

    Shimano Alfine CS-S500 Sprocket
    Safe riding,


  3. #3
    Reputation: sriracha's Avatar
    Join Date
    Jun 2004
    yeah, it's just an optional sprocket with an outer plastic chain guide attached. I ran that sprocket on my suspension bike setup, for extra security. On my hard tail, I used the sprocket without the chain guide.

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