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@Matisse
Second is a weird little thing I found on the new UN55. It’s listed as 73mm, but when installed there is a clear 5mm gap between the cup face and the bearing. A gap that can basically fill with water and mud and rust out the bearing and bb shell. This seems a very weird design by Shimano and I wonder if it’s a cost saving exercise now that 73mm shells are less popular.
To test it I picked up a UN71, which happens to be the period correct BB. There is a clear diff in length of the bb so as to make the cup sit flush with the nds cup. It’s very strange, has anyone else noticed this?
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