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Why
I think it was mostly for aesthetics , so the cups are not bigger than the shell even on steel frames
Are the bearings also smaller?
Yes, but they're still fine, and obviously bigger than internal ones which are also fine.
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To sell people, and bike mechanics, something new. For the cyclist, it’s a sleeker bearing set; for bike mechanics, it’s a new (…) tool to install said bearings.
gbj_tester
Leshaches
@kjlem
Why does my replacement Shimano hollowtech 2 bb have a smaller outside diameter than the old one? From 44 to 41 od. Are the bearings also smaller?