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  1. #1
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    What kind of bottom bracket is this?

    All it says is "Mountain GF". Can anyone tell me a compatible replacement?

    [IMG]Photobucket[/IMG]

  2. #2
    Bite Me.
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    Looks like Shimano external bearing, one drive side spacer, any version, slx, xt, xtr will work
    Last edited by cutthroat; 09-23-2012 at 01:16 PM.
    When I see an adult on a bicycle, I do not despair for the future of the human race. ~H.G. Wells

  3. #3
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    Shimano Hollowtech II on a 73mm shell. Keep the spacer and any Shimano Hollowtech II BB will interchange. Even the road ones.

  4. #4
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    Do Not Disassemble

    Because we want to sell you a new one!

  5. #5
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    Quote Originally Posted by cutthroat View Post
    Looks like Shimano external bearing, one drive side spacer, any version, slx, xt, xtr will work
    Spot on.

    EDIT: And you'll need both of these to replace it:
    Shimano FC32 Adapter Installation Tool > Accessories > Tools > Bottom Bracket Tools | Jenson USA Online Bike Shop
    Shimano TL-FC16 Installation Tool > Accessories > Tools > Crank & Chainring tools | Jenson USA Online Bike Shop

  6. #6
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    The Park BBT-9 has both of the tools in one wrench.

    Park Tool Co. BBT-9 : Bottom Bracket Tool : Bottom Bracket

    I'm going to pound out my bearings on my xt BB and see if i can press some new ones in.
    When the **** did we get ice cream?

  7. #7
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    Quote Originally Posted by crclawn View Post
    The Park BBT-9 has both of the tools in one wrench.

    Park Tool Co. BBT-9 : Bottom Bracket Tool : Bottom Bracket

    I'm going to pound out my bearings on my xt BB and see if i can press some new ones in.
    Have you found a source for bearings? It's been a while since I tried, but at the time my understanding was that the bearings where 6mm wide, not the industry standard 7mm for those diameters. I found bearings of the right size, but it was cheaper to just pick up a new BB for $35.

  8. #8
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    car_nut, thanks for that info. Anyone else found Shiano BB bearings that are reasonable?
    When the **** did we get ice cream?

  9. #9
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    Replacement bearings that are better/cheap:

    ENDURO BEARING KIT FOR X-TYPE BOTTOM BRACKETS

    WWW.TEAMDICKY.COM

    I get paid 3 every time I post on MTBR.

  10. #10
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    Thanks teamdicky. Will give those a try.
    When the **** did we get ice cream?

  11. #11
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    Quote Originally Posted by crclawn View Post
    Thanks teamdicky. Will give those a try.
    By the way, you can pick the seal off the cartridge with a safety pin and clean/lube the bearings for longer life.



    When it's time to replace them, it's not too hard to whack them out and press in the new.

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  12. #12
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    Teamdicky, what's your opinion on the stock bearings in the XT bottom bracket. I'm no bearing expert, but when I felt the bearings in my XT they really didn't feel that smooth. I got a Hope BB in today and the bearings feel alot smoother than the XT. The bearings are still good in the XT, still tight, nothing loose and no creaking. Fairly new, about 300 miles on them, but just don't seem like they spin that wheel when I rotate them with my hand. I def going to press in those bearings you recommended when I get some time.
    When the **** did we get ice cream?

  13. #13
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    Quote Originally Posted by teamdicky View Post
    Replacement bearings that are better/cheap:

    ENDURO BEARING KIT FOR X-TYPE BOTTOM BRACKETS

    Thanks dicky. I'll give those a try this winter.

  14. #14
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    Quote Originally Posted by crclawn View Post
    Teamdicky, what's your opinion on the stock bearings in the XT bottom bracket. I'm no bearing expert, but when I felt the bearings in my XT they really didn't feel that smooth.
    I prefer the life/serviceability of the Enduros. A Chris King would be sweet... but you gotta throw down some extra money for the service tools to do it yourself.
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  15. #15
    turtles make me hot
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    I have the Chris King bottom bracket on a couple of bikes. It was pricey getting the socket and grease tool, but it was the last money I spent on bottom brackets. I grease them every few months... Spins like the day I installed it.
    I like turtles

  16. #16
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    NYrr496, when you say socket tool, what tool are you talking about? Will a normal BB tool install the chris king BB? Like the ones mentioned above.
    When the **** did we get ice cream?

  17. #17
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    Attach a grease gun...

    Quote Originally Posted by crclawn View Post
    NYrr496, when you say socket tool, what tool are you talking about? Will a normal BB tool install the chris king BB? Like the ones mentioned above.




    Naysayers never apologize. Critics go to their grave thinking everyone else is wrong.
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  18. #18
    turtles make me hot
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    Quote Originally Posted by crclawn View Post
    NYrr496, when you say socket tool, what tool are you talking about? Will a normal BB tool install the chris king BB? Like the ones mentioned above.
    Yes, regular BB tools will install/remove a Chris King... BUT... The CK socket doesn't mark up the BB at all. It also works on Shimano and others.
    I like turtles

  19. #19
    gran jefe
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    you can buy all kinds of bearings at vxb.com. i'm not sure what dimensions we need, though.

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