Bottom brackets - advice required

Discussion in 'Bicycle Mechanics and Repairs' started by pubrunner, 6 Apr 2010.

  1. pubrunner

    pubrunner Guru

    Hi there,
    I'm looking to buy a square taper JIS bottom bracket;
    size 68mm X 119 or 120mm. This would be to go in a 753 steel frame.
    The only options that I've found are :

    a) Acor bottom bracket

    :biggrin: Stronglight JP400 in steel (a few pounds more for a lighter one with alloy cups)

    c) Shimano UN54

    All of these retail for about £15 - price isn't an issue.

    What I would like to know is:

    Are any of these to be recommended or avoided ?

    Can anyone recommend any other BB which is significantly better ? (Does anyone have anything better that they'd wish to sell ?)

    Are there any problems with using alloy cups in a steel frame ?

    Thank you for any advice/info.
     
  2. Steve Austin

    Steve Austin The Marmalade Kid

    Location:
    Mlehworld
    The Shimano BB's are pretty much indestructable ime. I use one on my commuter and it must be 10 years old
     
  3. Landslide

    Landslide Rare Migrant

    Location:
    Called to the bar
    Use copper grease to avoid seizing when you install it.

    As Steve says, the Shimano ones are fit, forget........................................:smile:
    Unless you're unlucky and get a dud, in which case it'll probably last less than a year, at which point I'd be taking it back to the shop.
     
  4. PpPete

    PpPete Guru

    Location:
    Chandler's Ford
    I researched a little while ago. Certainly read a few uncomplimentary things about the JP400. So although I was fitting a Stronglight branded chainset I went with a UN54. No complaints so far - although I hate the fact that the left cup is plastic.

    I've also used a Tange BB on another bike - ... has a metal L/H cup... not enough miles on that to judge how good, but they seem popular with the fixed crowd (with shorter spindles of course). There's an ebay seller that does all the different lengths - although they all seem to jump from 118mm to 122.5mm
     
  5. accountantpete

    accountantpete Legendary Member

    I use an external bearing based BB - much better IMHO.
     
  6. John the Monkey

    John the Monkey Frivolous Cyclist

    Location:
    Crewe
    Yep.

    do take care fitting the plastic cup - the splines get chewed up surprisingly easy. Cleaning the bb shell properly & greasing is a must.
     
  7. hubgearfreak

    hubgearfreak Über Member

    don't fit aluminium cups into into a steel frame:ohmy:
     
  8. snailracer

    snailracer Über Member

    Plastic cups are better than metal cups - won't seize, lighter, prevents damage to the BB threads in case of overtightening, won't creak.
     
  9. gwhite

    gwhite Über Member

    Location:
    Auchtermuchty Fife
    All true and they after a year or two, tend to splinter as you attempt to remove them.
     
  10. gwhite

    gwhite Über Member

    Location:
    Auchtermuchty Fife
    Better in what way? Certainly they don't seem as durable as inboard bearings but are a bit lighter I suppose, although what matters few grams. Quite a bit of drag also as I found when I ditched my new FSA chainset and returned to an old-fashioned cup and cone Campag Record BB combined with a Chorus triple chainset.
     
  11. 4F

    4F Active member of Helmets Are Sh*t Lobby

    Location:
    Suffolk.
    Shimano UN54, excellent product.
     
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