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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 07-11-07, 08:07 PM   #1
exfreewheeler
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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?
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Old 07-11-07, 08:40 PM   #2
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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.
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Old 07-11-07, 09:21 PM   #3
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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.
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Old 07-11-07, 09:23 PM   #4
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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.
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Old 07-11-07, 09:31 PM   #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
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Old 07-12-07, 05:28 AM   #6
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The UN73 & 53 are being discontinued and replaced by the UN54, which has a hollow axle similar to the 73.
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Old 07-12-07, 05:48 AM   #7
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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.
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Old 07-12-07, 08:01 AM   #8
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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.
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Old 07-12-07, 01:43 PM   #9
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Because it's sealed and it's a shimano?

Which one have a plastic non-drive cup?
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Old 07-12-07, 03:47 PM   #10
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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.
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Old 07-12-07, 05:35 PM   #11
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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.
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Old 07-12-07, 06:36 PM   #12
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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.
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Old 07-12-07, 06:43 PM   #13
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wierd, my UN71 had an aluminum cup.
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Old 07-12-07, 08:22 PM   #14
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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.
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Old 07-12-07, 08:50 PM   #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
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Old 07-12-07, 09:02 PM   #16
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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.
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Old 07-12-07, 09:18 PM   #17
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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.
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