The Shimano BB-RS500 Press-Fit Bottom Bracket is designed for smooth, efficient performance on modern road and gravel bikes. Built to fit BB86 press-fit frames (41 mm shell diameter × 86.5 mm shell width), it is fully compatible with Shimano Hollowtech II cranksets using a 24 mm spindle, including Tiagra.

Featuring sealed steel bearings, the BB-RS500 delivers low friction, reliable rotation, and long service life, even under regular training use. Lightweight resin cups help reduce overall weight while maintaining stiffness and quiet operation. Ideal for everyday riding, training, and endurance road use, it offers dependable Shimano quality at an excellent value.

Key Features & Specifications:

• Press-fit standard: BB86

• Shell diameter: 41 mm

• Shell width: 86.5 mm

• Spindle compatibility: 24 mm Hollowtech II

• Bearings: Sealed steel

• Cup material: Resin

• Approximate weight: 71 g

Perfect for riders looking for smooth pedalling, efficient power transfer, and long-lasting durability in a press-fit setup.