Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 22 Post(s)
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I suspect that Shimano redesigned the system to get around the problems that the old tight fitting sleeve had with corrosion. If water got into the BB the tight fitting overlap area would corrode, and the BB would be nearly impossible to remove. Reducing the contact area reduces the chances of the BB freezing together, but as noted by others, once it's in all the way, the ring makes a tight proper fitting contact with the BB unit.
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