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  1. #1
    mtbr member
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    Feb 2006
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    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?

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


  2. #2
    mtbr member
    Reputation: vikb's Avatar
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    Sep 2008
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    5,810
    Chain guard....none of mine have it and I've never missed it.

    Shimano Alfine CS-S500 Sprocket
    Safe riding,

    Vik
    www.vikapproved.com

  3. #3
    rollin
    Reputation: sriracha's Avatar
    Join Date
    Jun 2004
    Posts
    2,534
    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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