How Many Modern Bottom Bracket And Crank Standards Are There?

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  • How Many Modern Bottom Bracket And Crank Standards Are There?
  • walleater
    Member

    Trying to source a BB86 BB the other day and seeing a thread on BB30 a couple of minutes set my mind wandering… I’m a bike mechanic and I don’t even have a clue!

    I’m thinking stuff that you can still buy, not something from 1930…

    A quick thought to start proceedings and to delay cooking breakfast a bit longer:

    Square taper – JIS plus all the axle lengths
    Square taper – ISO plus all the axle lengths
    For above you’ve got 68, 73 or 70mm (Ita) to cover most BB options.
    ISIS – 68 / 73 / 83mm / 100mm BBs but all the different axles.
    External BB – 24mm axle. 68 / 73 / 83mm.
    Exernal BB – 19mm axle 68 / 73
    At this point I get a bit lost….
    BB30
    BB86
    BB85
    BB90
    BB92
    BB95
    Mid BB
    Plus all the 3 piece propriety BMX / DJ stuff…19mm axle Vs??
    ?

    watsontony
    Member

    for bmx and dj……

    there are 19,20 and 22mm axles

    there is also 8 spline, 36 spline and 48 spline

    and different lengths to accommodate bmx,mtb and dh bottom bracket shells

    and bb’s for these axles and for most frames. (threaded or press fit mostly)

    raisinhat
    Member

    For HTII at least 68mm and 73mm both use the same BB, it’s just spaced differently. 83mm requires a longer axle, but the BB is spaced just like a 68mm.

    There are far too many though. Relevant XKCD as always

    walleater
    Member

    Oooh I forgot Truvatit carp…..Powerspline, Howitzer etc.

    Thanks for the BMX info watsontony.

    For HT2, road stuff is 68mm specific.

    watsontony
    Member

    its just silly really.

    Mid, Spanish and American used to be the “standards” when I rode bmx. Dunno whether they’ve phased any of them out now though?

    Premier Icon ndg
    Subscriber

    Don’t forget road and MTB versions of the octalink BB, in a variety of axle lengths and BB widths

    watsontony
    Member

    Mid, Spanish and American used to be the “standards” when I rode bmx. Dunno whether they’ve phased any of them out now though?

    yea i think they are the diffrent type of press fit bmx bb’s.

    and you can get each it 19,10or22mm.

    i am going to put out an early guess. i think there will be around 30 different bb types in use today

    fivespot
    Member

    Which one is the standard standard 😕

    watsontony
    Member

    i would say the errrrr. depends what bike/cranks you got…………

    anyone still running square taper?

    Premier Icon martymac
    Subscriber

    which type of shell will they be inserted into?
    ie english, french, swiss or italian thread?

    walleater
    Member

    I can’t believe I forgot Octalink ha ha…

    Plenty of bikes come new with square taper.

    walleater
    Member

    Annnnnd there’s another one:

    BBright.

    v10
    Member

    BB65 on my Look… but not what id call a standard!

    amt27
    Member

    also, at least with the BB30, some standards come in a Push Fit version, PF30, both should be banned in the UK,

    both of which have come about because big manufacturers do not have the confidence in their Asian frame builders to tap a thread or mill a recess for a circlip, or want to save a few more pennies,

    Premier Icon singlespeedstu
    Subscriber

    Another one for you

    Available in 68/73 and 100.

    walleater
    Member

    BB91…..

    Seriously, is there a spreadsheet or similar that gives a breakdown of the axle diameter, BB width, ID etc of all these damn press fit BBs?!

Viewing 18 posts - 1 through 18 (of 18 total)

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