58 or 64 PCD??

MontanaGMT
MontanaGMT Posts: 36
edited May 2008 in MTB workshop & tech
Hi. I am getting a new outer chain ring for my bike, but have been confronted with a choice, 58 or 64 PCD...Could any1 please fill me in on what this means. Thanks.

Comments

  • nicklouse
    nicklouse Posts: 50,675
    bolt circle diameter. Pitch circle diameter.

    and it will be neither of those.

    what cranks have you got. and how many bolts hold the rings on. and what year are they.

    pictures?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • MontanaGMT
    MontanaGMT Posts: 36
    I dont know what year it was released, but its a good 5-6 years old. (2002 I think)

    iIts a FSA Alphadrive with 4 pins

    FSA_Alpha_Drive.jpg
  • nicklouse
    nicklouse Posts: 50,675
    outer middle rings will be 104mm bcd. and the granny will be 64mm bcd.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • MontanaGMT
    MontanaGMT Posts: 36
    Thanks for the info. :D

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