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Best BB standard

Discussion in 'Downhill & Freeride' started by troy, Apr 17, 2019 at 10:40 AM.

  1. troy

    troy Monkey

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    Working on a new enderpo bike. Was wondering what do You guys think is the best size and standard of the bottom bracket. Threaded? Press fit? If yes, which one BB92 or Press fit 30? Threaded BB cups for 30mm or 28.99 ( ͡° ͜ʖ ͡°) crank spindles are kinda hard to get... not sure how many of You still run 24mm spindle cranks.

     

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  2. rpet

    rpet Turbo Monkey

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    Threaded is the best, but I wouldn’t choose a new bike based on BB type.

    I put 1500mi on my PF30 bike with no creaks or blown bearings, so it’s a nonissue in the real world for me on this bike.
     
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  3. Wuffles

    Wuffles Chimp

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    Threaded BB. Don't really care about spindle size, but all the cranks I run are 30mm. Also drooling over the completely stupid and unnecessary Cane Creek EWings babies, and they're 30mm as well.

    I have had exactly 1 "PF" BB that didn't creek, and thats the wheels mfg one that threads into itself, and it's on a steel gravel bike.
     
  4. jonKranked

    jonKranked Press Button, Receive Stupid

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    this.

    also, i've run cranks with both 24mm and 30mm spindles (shimano & e13) and i can definitely notice the increased stiffness on the e13's with the 30mm spindle. disclaimer: i'm a bigger dude, probably 220lbs geared up.
     
  5. canadmos

    canadmos Mater Slayer

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    Threaded.
     
  6. 4xBoy

    4xBoy Turbo Monkey

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  7. Jeremy R

    Jeremy R <b>x</b>

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    If there are 50 different ones, can one even be considered a standard?
    I want to live in a world where there is one BB standard, one headset standard, and one rear hub standard.
    I had to do calculus this week and solve for X just to order a damn headset.
    Vote for me for your lizard king. I will make all your hopes and dreams come true...
     
  8. slimshady

    slimshady ¡Mira, una ardilla!

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    The red one.
     
  9. StiHacka

    StiHacka Compensating for something

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    ebikes don't need no BBs.
     
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  10. Jm_

    Jm_ Turbo Monkey

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    My external threaded RF BB on my fatbike1 is creaking like crazy. The threaded E13 on my threaded fatbike2 is silent as can be. Still have to investigate (maybe tonight) and make sure it’s not a cracky next SL arm, but it seems to be from the BB.

    Have PF30 aluminum BBs on the other two bikes and they run nice. Shitty plastic sram BBs really handicapped the 30mm rollout.
     
  11. kidwoo

    kidwoo Celebrating No-Pants Day

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    Hey everybody. I think JM needs an intervention. I'm gettin worried about the guy. Who's in?
     
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  12. slimshady

    slimshady ¡Mira, una ardilla!

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    #ShimItNao
     
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  13. Happymtb.fr

    Happymtb.fr Monkey

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    Internet is a good place for opinions. My anecdotal experience based on 24mm axles only says that sometimes bb92 and threaded can fail presumably based on how well the frame is build, tolerance-wise mostly.

    TLDR: bb doesn't matter as long as there is space for a bottle cage
     
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  14. Jm_

    Jm_ Turbo Monkey

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    Well I may have destroyed the frame in the process. Crank bolt was jammed on there, so I got a big breaker bar socket wrench, but as I went to try and turn it, the allen in the socket somehow fell out and into the BB. WTF? So I have to go and get a backup long allen wrench of the same type, but even with a breaker bar extender (pipe) I can't get it to budge. Try hitting it with a soft mallet, that does nothing. Can't find my metal mallet, but I find my hatchet, so hit the backside of the hatchet against the allen, trying to break it loose. Just as I finally get it to break loose, for two blows, somehow, even though I'm trying to be careful not to do this, it rebounds against the frame, like the santa-cruz test videos, but it doesn't look nice like those, two hits, one may have some delamination. F*ck. So I sand away the clear coat, put some epoxy on there, wrap it with some stretchy tape to help press the epoxy in there. The only not-so-bad part is this is a cheap chinese frame that cost around 400-500 in the first place, so not that big of a loss, but F, this went bad quickly. BB bearings appeared smooth too. Threaded BB interface seemed a bit crunchy.
     
  15. canadmos

    canadmos Mater Slayer

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    Send it off a few jumps and try it now?
     
  16. Sandwich

    Sandwich Pig my fish!
    Staff Member

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    Not sure if trolling or real life...

    BSA is generally considered to be the best by people who ride bikes. It facilitates easy installation and removal and doesn't force the owner to buy new tools. It also allows compatibility with virtually anything on the market and is basically foolproof.

    PF30 is probably the frame designer's favorite. It allows a massive spindle with good sized bearings. It incorporates a cup to accommodate frame tolerances and defects and the design allows for maximum theoretical stiffness and ease of manufacturing. This should be the best design.

    I think poor install contributes to creaking and the "design rush" that accommodates new standards makes for shitty bearings and shitty manufacturing.

    As for 24mm vs 30mm, I don't think it matters in real life. The stiffest cranks I've owned were saints with 24mm spindle and 165mm arms. I have SLX now and I can't tell the difference vs my RF atlas 30mm.
     
  17. StiHacka

    StiHacka Compensating for something

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    Another point for BSA is the ability to get creative with spacers and move the chainline where it needs to be.
     
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  18. kidwoo

    kidwoo Celebrating No-Pants Day

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    I had nothing to do with that.

    Really.
     
  19. Electric_City

    Electric_City The orangutans are loose!

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    Back to step #1- throw out the frame and get a new one. That's what I do when it comes to replacing a BB
     
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  20. Jm_

    Jm_ Turbo Monkey

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    Has potential.
     
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  21. rpet

    rpet Turbo Monkey

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    Using a hatchet for MTB maintenance is A+ !! I love that.
     
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  22. Gary

    Gary "S" is for "neo-luddite"

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    #mine needed 3 in 1800 miles and one year of use

    they're big fuckers.



    Fuck BSA and its old fashioned two big thread standard

    Shimano 6 x T40 bolt fitting standard FTW
     
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  23. jonKranked

    jonKranked Press Button, Receive Stupid

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    Kill List.
     
  24. Gary

    Gary "S" is for "neo-luddite"

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    Dude. the things are on 24hr suicide watch


    Warden's gotta piss tho
     
  25. Olly

    Olly Chimp

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    Haha, I was going to post a picture of the pinion 12 speed BB!
     
  26. slimshady

    slimshady ¡Mira, una ardilla!

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    :picsstfu:
     
  27. shirk007

    shirk007 Monkey

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    Best option is the one that nobody is using yet. BB392

    You get the wide bracing angle advantage of BB92 and you run the bigger PF30 bearings to better accommodate 30mm spindles.