8 Spline 19mm Bottom Bracket Set

A complete 19mm bottom bracket set built around an 8-spline axle interface, supplied with all hardware needed for a full installation including bearings, spacers, dust caps, and mounting bolts.

Key Features

• 8-spline axle interface — Splined connection between the axle and crank arms provides a more positive, non-slip engagement compared to square taper or smooth axle designs, distributing rotational load across multiple contact points
• 19mm axle diameter — Standard 19mm sizing compatible with 19mm 3-piece crank sets and corresponding BB shells
• Complete hardware set — All necessary installation components included in a single purchase, eliminating the need to source spacers, bolts, or dust caps separately
• Dual bearings — One bearing per side provides smooth, low-friction axle rotation and handles the lateral and radial loads generated during pedaling and riding

Technical Specifications

• Axle: 8-spline, 19mm
• Axle bolts: x2
• Spacers: x4
• Dust caps: Right and left
• Center tube spacer: x1
• Bearings: x2
• Sprocket mount bolt: x1

Compatibility and Ideal Use Cases

Compatible with 19mm 3-piece crank sets using an 8-spline axle interface — confirm crank spline count and axle diameter before ordering as not all 19mm cranks use an 8-spline interface. Spacer configuration allows fitment across different BB shell widths. Best suited to riders building or replacing a complete bottom bracket assembly on a 3-piece crank setup.