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Old 06-13-08, 01:16 PM   #1
goldfishin
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how does the new un54 bb compare to the old un73 bb?

it looks like i'm going to have to get a un 54 bb as my new cranks don't work with my old bb suprisingly enough.

what should i expect as far as quality and weight?

is there any place that still has the old un73?
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Old 06-13-08, 02:21 PM   #2
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You'll get huge weight saving because UN54 is plastic.
But overall it's a good bb.

www.biketoolsetc.com has high quality Tange bottom brackets:



The Tange LN79 Series bottom brackets feature an aluminum alloy body & cups, and a forged steel spindle with standard 8mm crank bolt threads. High quality and lightweight at an affordable price. 220 grams! Made in Japan.

Last edited by Barabaika; 06-14-08 at 08:50 PM.
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Old 06-13-08, 02:58 PM   #3
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I thought that they were both metal, with a plastic fixed cup that threads into the non-drive side.
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Old 06-13-08, 04:08 PM   #4
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Originally Posted by Barabaika View Post
You'll get huge weight saving because UN54 is plastic.
But overall it's a good bb.

www.biketoolsetc.com has high quality Tange bottom brackets:


The UN54 is still metal, the only plastic (phenolic) parts is the non-drive side cup. The 54 combines the weight reduction of the 73 (hollow spindle) with the pricepoint of the 53. Basically Shimano combined the two lines into one.

Why do you say your crank doesn't work with the old bb?
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Old 06-13-08, 07:52 PM   #5
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Originally Posted by Barabaika View Post
www.biketoolsetc.com has high quality Tange bottom brackets:

Tange makes high quality bb's?
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Old 06-13-08, 08:07 PM   #6
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it's not the right spindle lenght. the old cranks were the m480 and the new are the m460. i couldn't even shift into the small ring. :/
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Old 06-14-08, 11:35 AM   #7
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Tange makes high quality bb's?
I heard that Tange made bbs for Shimano.
What's so special about bb? When it starts to creak, you just put a new one. They are cheap.

Yes, there is always something that has higher quality.
But in the bike industry it means exotic materials and lighter weight.

What about this bb for $90?

FSA Cartridge Bottom Bracket

The Ultimax Carbon/Titanium Cartridge Bottom Bracket features a carbon fiber body, cold forged aluminum cups, and a hollow titanium spindle with standard 8mm crank bolt thread. 68mm (English) shell width, 110.5mm spindle length, 170 grams. Made in Taiwan.

Last edited by Barabaika; 06-14-08 at 11:46 AM.
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Old 06-14-08, 06:31 PM   #8
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Hawley catalotg is showing that the UN54 is over 300 grams...seems kind of heavy to have a hollow spindle...
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