Bicycle Mechanics - Bottom Bracket

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uhm...yea.
04-16-02, 04:57 AM
Okay, I know this has been brought up before, call me a clod, but I still don't quite understand. what, exactly, is the difference between UN-52, UN-72, ect?
RainmanP
04-16-02, 07:42 AM
I'm not sure either. They seem to be pretty much interchangable. Someone reported concerns with certain cranksets, including Sugino, seating properly on the UN72. I am using a Sugino crank on a UN72 with no apparent problem, but I may not be experienced enough as a mechanic or cyclist to know whether it is correct or not.
Richard D
04-16-02, 09:03 AM
UN72 uses slightly higher quality bearings than UN52, and I believe UN72 uses a hollow axle.
Richard
uhm...yea.
04-16-02, 03:00 PM
What about a UN-42? even worse quality?
Richard D
04-17-02, 03:57 AM
Originally posted by uhm...yea.
What about a UN-42? even worse quality?
I've not come across it. I'm running a UN52 and it seems perfectly adequate.
Richard
uhm...yea.
04-17-02, 04:03 AM
Thanks for all the info, think i know what i need now.
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