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  1. #1
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    What the heck is missing from my new crankset?




    Bought the M660-10 crankset from merlincycles, it came with the BB so I figured it came with everything needed to install...so why the hell can I see all the way through the center?

    The only things left over after the install is 3 spacers for the BB...

    I don't see anything on shimano's exploded diagram either??

    http://techdocs.shimano.com/media/te...9830799247.pdf
    2013 Trek/Gary Fisher Rumblefish Elite XXL/23"
    120mm 29er

    2004 Santa Cruz Bullitt XL White
    170mm 26er

  2. #2
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    Why do you assume you've missed something?
    Aren't manufacturers allowed to make things hollow so they can be light?
    Rimmer - "There's an old human saying - if you talk garbage, expect pain"

  3. #3
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  4. #4
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    Quote Originally Posted by e-luder View Post
    Rep points for you e-luder - made my day

    To the OP, Shimano BBs are hollow

    Quote Originally Posted by Blind View Post
    The only things left over after the install is 3 spacers for the BB...
    Even on a 73mm BB shell you should have used one spacer on the drive side to get the chainline right, unless you have a BB mounted FD or chain device, which it doesn't look like you have from the photos. May also be why the plastic safety tab isn't engaged on the first photo, as your non-drive side crank is installed too far on the spindle...

    And one final observation... you know you've got ten speed cranks and a nine speed front mech there? Be careful how you mix things, as some combinations will work and others wont - there's a whole long sticky on it at the top of this forum.
    Last edited by PerthMTB; 04-11-2013 at 06:50 AM.

  5. #5
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    Quote Originally Posted by PerthMTB View Post
    Rep points for you man - made my day!

    To the OP, Shimano BBs are hollow



    Even on a 73mm BB shell you should have used one spacer on the drive side to get the chainline right, unless you have a BB mounted FD or chain device, which it doesn't look like you have from the photos. May also be why the plastic safety tab isn't engaged on the first photo, as your non-drive side crank is installed too far on the spindle...

    And one final observation... you know you've got ten speed cranks and a nine speed front mech there? Be careful how you mix things, as some combinations will work and others wont - there's a whole long sticky on it at the top of this forum.
    Good point. There should never be 3 spacers left unused. Depends on the BB:

    68mm BB uses 2 spacers - one on either side
    73mm BB uses 1 spacer - on the drive side

    Also the axle being hollow is just how its meant to be.

  6. #6
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    Quote Originally Posted by DimitrisCSD View Post

    68mm BB uses 2 spacers - one on either side
    Small correction - the normal situation with a 68mm BB shell is two spacers on the drive side, and one on the non-drive side. Only if there's a plate from a BB mounted FD or chain device in place of one of the spacers would you have only one on the drive side.
    Last edited by PerthMTB; 04-11-2013 at 06:48 AM.

  7. #7
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    Quote Originally Posted by PerthMTB View Post
    And one final observation... you know you've got ten speed cranks and a nine speed front mech there? Be careful how you mix things, as some combinations will work and others wont - there's a whole long sticky on it at the top of this forum.
    It works perfectly fine, but how can you tell it's a 9-speed FD? It's an FD-M770 XT. I didn't even have to adjust it with how the crankset is installed now, I only had to loosen the fixing bolt and lower the FD as my old crankset had a 42t large ring and this new one is a 36t. All 30 gears work with zero rub. No adjustment of the high/low speed screw stops at all.
    2013 Trek/Gary Fisher Rumblefish Elite XXL/23"
    120mm 29er

    2004 Santa Cruz Bullitt XL White
    170mm 26er

  8. #8
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    Quote Originally Posted by Blind View Post
    It works perfectly fine, but how can you tell it's a 9-speed FD? It's an FD-M770 XT. I didn't even have to adjust it with how the crankset is installed now, I only had to loosen the fixing bolt and lower the FD as my old crankset had a 42t large ring and this new one is a 36t. All 30 gears work with zero rub. No adjustment of the high/low speed screw stops at all.
    Well, the Mega 9 sticker on the cage (visible in pic #2) might have something to do with that

  9. #9
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    It works perfectly fine, but how can you tell it's a 9-speed FD? It's an FD-M770 XT. I didn't even have to adjust it with how the crankset is installed now, I only had to loosen the fixing bolt and lower the FD as my old crankset had a 42t large ring and this new one is a 36t. All 30 gears work with zero rub. No adjustment of the high/low speed screw stops at all.
    Wschruba has it right - there's a 'Mega 9' sticker on your FD that gives it away.

    The XT M770 was the current gear when Shimano transitioned from 9sp to 10sp, but instead of doing the sensible thing and giving the 10 speed stuff a new model number, Shimano confused us all by calling the 9sp stuff M770 and the 10 speed stuff M770-10. In outward appearance the easiest way to tell is the 9sp has this logo...

    Name:  mega9.jpg
Views: 370
Size:  4.2 KB

    And 10sp will have this...

    Name:  Dynasis.jpg
Views: 370
Size:  3.7 KB

    By the way, that's definitely not a 36T outer chainring in your photos, its the standard M660-10 configuration of 24/32/42

    Anyway, if it all works fine, that's the important thing - enjoy!
    Last edited by PerthMTB; 04-11-2013 at 07:45 PM.

  10. #10
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    Quote Originally Posted by DimitrisCSD View Post
    Good point. There should never be 3 spacers left unused. Depends on the BB:

    68mm BB uses 2 spacers - one on either side
    73mm BB uses 1 spacer - on the drive side

    Also the axle being hollow is just how its meant to be.
    A 73mm shell with an E-type FD will have zero spacers. Perhaps in a few years they will stop making E-type, if they have't already and a few years after that we can cut the Z factor by 2.5mm.

  11. #11
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    Quote Originally Posted by wschruba View Post
    Well, the Mega 9 sticker on the cage (visible in pic #2) might have something to do with that
    Quote Originally Posted by PerthMTB View Post

    By the way, that's definitely not a 36T outer chainring in your photos, its the standard M660-10 configuration of 24/32/42
    Wow CSI - Shimano Parts... awesome

  12. #12
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    Quote Originally Posted by PerthMTB View Post
    By the way, that's definitely not a 36T outer chainring in your photos, its the standard M660-10 configuration of 24/32/42

    Anyway, if it all works fine, that's the important thing - enjoy!
    sorry, just planning ahead for when the bashguard and middle ring I purchased arrives, it will be 24/36/bash at that point.

    I pulled it apart this morning and added a spacer to each side, had to fiddle with the FD adjustment a little bit but it's shifting quickly and smoothly through all the gears now (even the temporary big ring).

    I'm still super confused by the big hole in the side, I've only had cartridge BB square taper cranksets on all my bikes in the past so forgive my ignorance.
    2013 Trek/Gary Fisher Rumblefish Elite XXL/23"
    120mm 29er

    2004 Santa Cruz Bullitt XL White
    170mm 26er

  13. #13
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    What the heck is missing from my new crankset?

    It's just a hollow spindle. No need for the added weight.

    It's hard to tell but it almost looks like the safety tab on the non drive side doesn't have one of the bolts going thru it. I don't recall it sticking up that far but then again its been a while since I've had shimano cranks.
    WHY ARE YOU YELLING??!1

  14. #14
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    Quote Originally Posted by Ilikemtb999 View Post
    It's hard to tell but it almost looks like the safety tab on the non drive side doesn't have one of the bolts going thru it. I don't recall it sticking up that far but then again its been a while since I've had shimano cranks.
    Yes that piece should be inside the slot in the crank arm.
    Attached Thumbnails Attached Thumbnails What the heck is missing from my new crankset?-stopper_plate.jpg  


  15. #15
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    What the heck is missing from my new crankset?

    Exactly that. Like I said hard to tell in the pic but it sure looks like that's what's going on ;D
    WHY ARE YOU YELLING??!1

  16. #16
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    I think that's where you're supposed to stash your weed.

  17. #17
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    Re: What the heck is missing from my new crankset?

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