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  1. #1
    Stinky McStinkface exfreewheeler's Avatar
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    Shimano BB UN73 et al...

    On Nashbar I saw they ( UN73 ) were on sale for $18.

    They also have the UN53 for $23

    and the UN54 for $20.

    Are these good or decent BB's and are they compatible with the Sugino RD2?

    I thought I saw someone say something good about the UN73.

    What about chainline?

    BTW, the sale ends on 7/12 so can I know soon?
    Because, yeah... uh huh! Umm, yeah!

  2. #2
    Jersey Boy Yeah ieandro's Avatar
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    Those are pretty good BB's for common riding. While lacking any special performance characteristics, they are pretty solid, well made BB which will last you for many miles.

    The UN73 is in between the UN53 and UN93 models with the higher numbers having less weight.

    At 18 bucks a pop, you can't really complain either.
    Jersey Native

  3. #3
    Beausage is Beautiful Fugazi Dave's Avatar
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    Good, smooth, single-shot BBs. Not the best BB money can buy, but they perform well and one can hardly beat the value.

  4. #4
    out of shape
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    I don't know if they're the right spindle length for the RD2, I seem to recall Shimano BBs only being 109 and up.

  5. #5
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    http://www.benscycle.net/index.php?m...roducts_id=656

    http://www.benscycle.net/bmz_cache/1...ge.150x112.jpg

    larger image
    Sugino BB (68x103mm)
    $28.99


    SUGINO BB 68x103

    The matching bottom bracket for the Sugino RD crankset. A sealed bearing cartridge BB at a good price.

    103mm length
    Fits 68mm bottom bracket shells
    1.370" x 24tpi - English threading

  6. #6
    Perineal Pressurized dobber's Avatar
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    The UN73 & 53 are being discontinued and replaced by the UN54, which has a hollow axle similar to the 73.
    This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.

  7. #7
    jack of one or two trades Aeroplane's Avatar
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    A 107 will work pretty well with a Sugino crankset. I had cranks set up that way for a long time.
    Quote Originally Posted by Dr Irwin Goldstein
    Men should never ride bicycles. Riding should be banned and outlawed. It is
    the most irrational form of exercise I could ever bring to discussion.

  8. #8
    aka mattio queerpunk's Avatar
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    a UN53 is a good BB. i've had one in for two years, all weather, lots and lots and lots of miles (150+/week for half of those two years). it's still going strong. why? can't say.
    the hipster myth.

    i practice vagabondery.

  9. #9
    Senior Member
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    Because it's sealed and it's a shimano?

    Which one have a plastic non-drive cup?

  10. #10
    THIS SPACE FOR RENT
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    Don't get that to go with an RD2, this has been causing major drama lately but basically the recent RD2's seem to only be happy with the 103mm sugino BB pointed out above. I put one on a 107 and the chainline was like 47mm on the outer ring position. Don't get any other BB, you'll regret it.
    "I don't buy new frames, it just encourages them."

    -T.G.

  11. #11
    Jersey Boy Yeah ieandro's Avatar
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    Quote Originally Posted by Daijoubu
    Because it's sealed and it's a shimano?

    Which one have a plastic non-drive cup?


    If i'm not mistaken, the UN50. UN70, and UN90 all used plastic non driveside cups. These models have all been replaced and upgraded over the years from UN51, UN52, UN53 and the same goes for the UN71 series and UN91 series. They all utilized either steel or aluminum cups starting with the 51, 71, 91 series.
    Jersey Native

  12. #12
    cab horn
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    Quote Originally Posted by ieandro
    If i'm not mistaken, the UN50. UN70, and UN90 all used plastic non driveside cups. These models have all been replaced and upgraded over the years from UN51, UN52, UN53 and the same goes for the UN71 series and UN91 series. They all utilized either steel or aluminum cups starting with the 51, 71, 91 series.
    The UN51/2/3 have plastic cups. Same with the UN71.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  13. #13
    Jersey Boy Yeah ieandro's Avatar
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    wierd, my UN71 had an aluminum cup.
    Jersey Native

  14. #14
    Stinky McStinkface exfreewheeler's Avatar
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    Quote Originally Posted by Landgolier
    Don't get that to go with an RD2, this has been causing major drama lately but basically the recent RD2's seem to only be happy with the 103mm sugino BB pointed out above. I put one on a 107 and the chainline was like 47mm on the outer ring position. Don't get any other BB, you'll regret it.
    won't do. I guess it was made for it for a reason. was trying to save some $. sometimes you just gotta go with right stuff. Thanks.
    Because, yeah... uh huh! Umm, yeah!

  15. #15
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    they switched to plastic cups like maybe a year ago? something like that, I order 3-4 every year and this year they all had plastic cups, last year they were aluminum, still have 1 left

  16. #16
    Jersey Boy Yeah ieandro's Avatar
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    nothing wrong with the plastic cups, you just have to be more careful when installing. Obviously, they are much softer than their metal counterparts. They will crack and deform if torqued to the extreme, which the metal cups can withstand a bit more (not too much, though) torque over specs.

    Since I don't have a torque wrench, i have the metal cups.
    Jersey Native

  17. #17
    cab horn
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    Quote Originally Posted by ieandro
    Since I don't have a torque wrench, i have the metal cups.
    You'll find that it's unecessary to have a torque wrench for the plastic cups.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

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