Thread: Bottom Bracket: Replacing UN72 with UN55. HELP!!!
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Old 04-07-20 | 01:48 PM
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noobinsf
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Bikes: '82 Univega Competizione, '72 Motobecane Grand Record, '83 Mercian KOM Touring, '85 Univega Alpina Uno, '76 Eisentraut Limited

Originally Posted by Papa Tom
Would the threads be different?
No, but the spindle/cartridge is longer to compensate for the wider 73mm bottom bracket shell for which it is intended (vs the 68mm shell that you have). Your cups are bottoming out on the cartridge contact points.
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