The SM-BB72 is Shimano's Ultegra-level press fit bottom bracket for road frames with a BB86 shell, the 86.5mm-wide, 41mm-bore standard used on many carbon road frames. It takes any HollowTech II road crankset and is a simple like-for-like replacement when the old bearings start to feel rough or creak.

The cups are made from fibre reinforced polymer rather than alloy, which is kinder to carbon shells and reduces the creaking that metal cups can develop in a press fit frame. The bearings are sealed inside the cups to keep water and grit out, so there's nothing to service - when it's worn, you replace it. An inner cover runs between the cups to protect the bearings from anything that finds its way down the seat tube.

Features

• Press fit design for 86.5mm (BB86) road shells with a 41mm bore
• Compatible with Shimano HollowTech II road cranksets
• Fibre reinforced polymer cups reduce the risk of frame noise and damage
• Sealed bearings keep out dirt and water
• Maintenance free
• Supplied with left and right cups, inner cover and O-rings

Specification

• Model: SM-BB72-41B
• Standard: Press fit BB86 road
• Shell width: 86.5mm
• Cup diameter: 41mm
• Cup material: Fibre reinforced polymer
• Crank compatibility: Shimano HollowTech II road (24mm spindle)
• Contents: Left and right cups, inner cover, inner O-rings