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  1. #1
    mtbr member
    Join Date
    Jun 2007

    Difference between Shimano 36 tooth chainring on SLX 660 and SLX 665?

    Getting a 36 tooth chainring to run 2x9 on my SLX 660 cranks. Anyone know the difference between the two 36 tooth chainrings offered for the SLX 660 and SLX 665 cranks?

    They have two different part numbers for the two 36 tooth rings and they are not compatible according to Shimano tech docs. Confused as to what will fit on what in the 36 tooth size.

    Would any 36 tooth Shimano ring from say the FC761 or FC771 fit the SLX FC660 Crank?

    I currently have the following crank: Shimano FC 660 with 22-32-44

    I want to change the setup to a double with 22 or 24 and 36 tooth chainrings. There are two different chainrings for the SLX lineup. The chainring for the FC665 appears to have different tabs for the bolts than the 32 tooth for the FC660. To run the double on the FC660, do I need to buy the 36 tooth ring made for the FC665, or does it matter? Are the shift pins different on each 36 tooth ring? The stores say to buy the 36 tooth ring made for the FC665 if you want to run a 22-36 double setup, but I am not sure that particular ring will fit the FC660 crank because the photos show slightly different bolt tabs for each ring.

    I am trying to avoid the annoying discovery that yet another Shimano chainring won't fit my current crank because of some small alteration of the ring.

    Thanks in advance.
    Last edited by Wildeyes; 07-26-2011 at 05:39 PM.
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  2. #2
    Old school BMXer
    Reputation: Blaster1200's Avatar
    Join Date
    Feb 2004
    The difference is because the 36 on the 660 crank is designed to work with a 26 small ring whereas the 36 on the 665 is designed to work with a 22 small ring. The shape, shifting ramps and pins on the chainring are designed to work with its corresponding small ring.

    Yes, you can use a mismatched setup, but it won't upshift as good, but it will still shift.
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  3. #3
    mtbr member
    Join Date
    Jun 2007
    Thanks. I will order the ring built to work with the 22 tooth small ring up front.

    Appreciate it.
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    And What I See Is Me!

  4. #4
    mtbr member
    Reputation: GTscoob's Avatar
    Join Date
    Apr 2009
    There's also XT quality 36T trekking rings if you're looking to shave a little weight.

    Which would shift better to a 24T ring, the 36T meant for a 22T or the 36T meant for a 26T? 22/36 seems like too much of a spread.

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