XTR

Shimano's XTR bottom brackets deliver reliable, smooth-spinning performance for demanding riders. These Hollowtech II bottom brackets feature a new seal construction that promotes smoother rotation while helping to protect against contamination, keeping your drivetrain running efficiently over time.

• New seal construction designed for smoother rotation and improved durability.
• Hollowtech II technology for efficient power transfer and reduced weight.
• Available in two shell I.D. options: 1.37-inch (SKU ISMBB93B) and 41mm (SKU ISMBB9441A) to fit common frame standards.
• Engineered to Shimano's XTR performance standards for precise, dependable operation.