In the newest edition of Shimano's top end component group, the bearing of the Dura-Ace bottom Bracket, the bearings are positioned to the outside to provide better weight distribution and more stability. This years model has slightly smaller bearings which allowed the shaving of a few grams.
New improved sealing ensures 50% less drag
Available for English and Italian Threaded Bottom Bracket applications
Highly recommended for those wishing to upgrade from their old-fashioned sealed bottom brackets with the old style threads. There was not a lot of cost difference between this and the other Shimano bottom brackets so just went ahead with the Dura-Ace version.
Pretty easy to install. Came with its own tool adapter.
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