1. The most important thing about buying a new bike is to make sure it fits. The only way you'll know if the bike is right for you is to size up the bike and make sure that the bike's geometry matches your body's geometry. Ask questions and do some research.
mtn. biking 101
2. If possible, try to find a shop that will let you demo the bike on real dirt. Five minutes in a parking lot won't cut it. You wouldn't buy a car without a real world test drive, and a bike should be no different.
3. Don't belive the hype. Just because your favorite rider or best friend rides a certain bike, that doesn't mean that's the best one for you. Have an open mind and be realistic about your needs and ability.
Results 1 to 17 of 17
  1. #1
    mtbr member
    Reputation:
    Join Date
    Jul 2012
    Posts
    200

    Cobia BB Compatibility??

    I want to replace the stock crankset on my '12 Cobia. With the sales going on I can also get into a SRAM Ceramic GMP Bottom bracket.

    Question is, will the GXP BB fit my '12 Cobia? The stock BB is internal bearing and the GXP is External. I just want to be sure before I jump on it.

    Any help is appreciated.

  2. #2
    banned
    Reputation:
    Join Date
    Sep 2012
    Posts
    1,510
    Quote Originally Posted by cbd5600 View Post
    I want to replace the stock crankset on my '12 Cobia. With the sales going on I can also get into a SRAM Ceramic GMP Bottom bracket.

    Question is, will the GXP BB fit my '12 Cobia? The stock BB is internal bearing and the GXP is External. I just want to be sure before I jump on it.

    Any help is appreciated.
    There are two parts to the answer:

    Yes, the BB is a standard 68/73mm BB and external bottom brackets like the SRAM GXP, Shimano Hollowtech II, Hope Tech, and Race Face EXI will fit.

    Even though the external BB will fit, you will definitely need a new crank. The standard cartridge-style "Powerspline" BB on your bike comes as one unit and the crank spindle is part of the BB. You will need a crankset that is either GXP compatible or Hollowtech II/Raceface compatible (Both the HT-II and RF cranksets come with a 24mm spindle. I'm not sure about the GXP)

    In summary: Yes the GXP BB will fit, but you will need a new crankset too.

    -S

  3. #3
    mtbr member
    Reputation:
    Join Date
    Jul 2012
    Posts
    200
    Great Information. Thank you for the quick response.

  4. #4
    mtbr member
    Reputation:
    Join Date
    Jan 2012
    Posts
    5,338
    The non drive side bearing on a new SLX bottom bracket I installed was very light on grease at installation. Check both and load before using. The plastic cover and seal can carefully be pried off for servicing. I pry around the outside of each with the thin edge not tip of a flexible knife until it starts to come up.

  5. #5
    Perfectionist with ADHD!
    Reputation: ChewynMe's Avatar
    Join Date
    Apr 2012
    Posts
    136
    CB I am not sure if you have made a purchase yet, but I too have a 2012 Cobia and just bought the X9 crankset from Jenson for $100 with the GXP BB. LBS (Trek Dealer) said it fits, no problem, and that it was a very good upgrade for the $$$

  6. #6
    mtbr member
    Reputation:
    Join Date
    Jul 2012
    Posts
    200
    Quote Originally Posted by ChewynMe View Post
    CB I am not sure if you have made a purchase yet, but I too have a 2012 Cobia and just bought the X9 crankset from Jenson for $100 with the GXP BB. LBS (Trek Dealer) said it fits, no problem, and that it was a very good upgrade for the $$$
    I picked up the same BB from Jenson as well. Just got here yesterday. I am hoping to get it installed on Tuesday.

  7. #7
    Perfectionist with ADHD!
    Reputation: ChewynMe's Avatar
    Join Date
    Apr 2012
    Posts
    136
    I haven't put mine on yet, but please let me know how it goes! Kick some dirt when you are done.

  8. #8
    mtbr member
    Reputation:
    Join Date
    Jul 2012
    Posts
    200
    I will for sure. I'm trying to figure out ow to get it done faster. It will be interesting to see the weight difference over stock. The new crank and BB came right at 880g.

  9. #9
    Perfectionist with ADHD!
    Reputation: ChewynMe's Avatar
    Join Date
    Apr 2012
    Posts
    136
    My bet is not much, unless the howitzer BB included with the S800 weighs a ton. 100-150g?

  10. #10
    mtbr member
    Reputation:
    Join Date
    Jul 2012
    Posts
    200
    Dropped it off at my LBS today. Should be ready Tuesday. The FD might be an issue with the new crank, but hopefully he can get it to work.

  11. #11
    mtbr member
    Reputation:
    Join Date
    Jul 2012
    Posts
    200
    Picked my bike up yesterday, but the weather has been terrible so no ride yet. The new crank is actually 38g heavier than the stock one. The bottom bracket however is 288g lighter.

    Here it is all installed.




  12. #12
    Perfectionist with ADHD!
    Reputation: ChewynMe's Avatar
    Join Date
    Apr 2012
    Posts
    136
    Wow our garage walls look so similar! It looks like you went 1X10? Or is it two but I can't see the inner ring? Bold move BTW choosing the red. I'm jealous.
    ****I should ride less and post more****

  13. #13
    Perfectionist with ADHD!
    Reputation: ChewynMe's Avatar
    Join Date
    Apr 2012
    Posts
    136
    [QUOTE=cbd5600;9955037]Picked my bike up yesterday, but the weather has been terrible so no ride yet. The new crank is actually 38g heavier than the stock one. The bottom bracket however is 288g

    That a net loss of 250g's. not too bad!
    ****I should ride less and post more****

  14. #14
    mtbr member
    Reputation:
    Join Date
    Jul 2012
    Posts
    200
    Quote Originally Posted by ChewynMe View Post
    Wow our garage walls look so similar! It looks like you went 1X10? Or is it two but I can't see the inner ring? Bold move BTW choosing the red. I'm jealous.
    Its 2x10 right now. We'll see how it does after a few rides. I never came out of the middle ring with the stock setup and I was always in the middle to upper half of the rear gears. I ordered a 12-26 rear cog that will get me closer to what I had running the middle gear up front and the stock 11-36 in the rear. If that works out well, i'll probably ditch the big ring for a bash guard.

  15. #15
    Cow Clicker
    Reputation: wmac's Avatar
    Join Date
    Sep 2010
    Posts
    2,349
    Quote Originally Posted by cbd5600 View Post
    Its 2x10 right now. We'll see how it does after a few rides. I never came out of the middle ring with the stock setup and I was always in the middle to upper half of the rear gears. I ordered a 12-26 rear cog that will get me closer to what I had running the middle gear up front and the stock 11-36 in the rear. If that works out well, i'll probably ditch the big ring for a bash guard.
    Whoa, what? You ordered a 12/26? I sort of get it if you're looking to lose weight, but that's cutting your range down quite a bit. You sure you don't want to keep that low gearing for those really big climbs at the end of a really long ride?
    No, YOU don't understand. You're making an ass of yourself for all of eternity.

  16. #16
    Perfectionist with ADHD!
    Reputation: ChewynMe's Avatar
    Join Date
    Apr 2012
    Posts
    136
    [QUOTE=cbd5600;9955037]Picked my bike up yesterday, but the weather has been terrible so no ride yet. The new crank is actually 38g heavier than the stock one. The bottom bracket however is 288g lighter.

    Here it is all installed.

    ---Ok so on my phone only the middle pic showed up, now I see the whole deal. Looks great and I hope it works out as smoothly as you (an by extension I) planned. I will not have tiome to install mine until after Xmas. But I stuck to a 12-32 in the rear, and the 28-39 up front.

    Happy Dirt.
    ****I should ride less and post more****

  17. #17
    mtbr member
    Reputation:
    Join Date
    Jul 2012
    Posts
    200
    Quote Originally Posted by wmac View Post
    Whoa, what? You ordered a 12/26? I sort of get it if you're looking to lose weight, but that's cutting your range down quite a bit. You sure you don't want to keep that low gearing for those really big climbs at the end of a really long ride?
    The new front gear is a step down from 33t to 28t and will almost offset the step down in the rear. I will be losing a little bit as the ratio will drop from .92/1 to 1.08/1.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •