The Shimano Press Fit BB SMBB7141 is a complete press-fit bottom bracket assembly for Shimano HollowTech II MTB cranks. The cups are sealed to keep out dirt and water for durability and long running life. The cups are made from fibre reinforced polymer material which reduces the risk of frame noise and damage. This BB will provide a durable, quiet and quality ride. Key Features: - It is made for mountain bikes- It has a 41mm cup diameter- It is compatible with 89.5mm (with 2.5mm spacer) and 92mm shells- The cups are made from fibre reinforced polymer material

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