The Shimano Dura Ace BB-R9100 Hollowtech II Bottom Bracket is a high-quality bicycle part designed for optimal performance. With a shell width of 68mm, it is compatible with a wide range of bikes. The Hollowtech II design ensures a lightweight and durable construction, making it a reliable choice for riders looking to upgrade their bottom bracket. Shimano is a trusted brand known for producing top-notch cycling components, making this product a great addition to any bike. USA shipping only.