Shimano HollowTech II bottom bracket assembly.

– Length of screw thread is increased to enable the fitment of chain devices

– Set includes left and right hand cups spacer inner cover and inner O-rings

– Light weight seal structure helps to remove vital grams

– Sealed cups keep out dirt and water

– Compatible with 83 mm shells

– Durable gold anodised finish

– Easy installation

– Maintenance free

– English thread