Shimano M770 XT / M660 SLX HollowTech II bottom bracket set - English thread.
Genuine Shimano HollowTech II bottom bracket assembly
Set includes left and right hand cups, spacers, inner cover, and inner O-rings
Light weight seal structure helps to remove vital grams
Sealed cups keep out dirt and water
Maintenance free
Compatible with 68 mm and 73 mm shell
Durable silver anodised finish
Easy installation