Colony Mid Bottom Bracket - Polished (19mm)

Product Overview

The Colony Mid Bottom Bracket is a CNC-machined aluminum mid BB kit featuring unique detailing and polished finish. Designed for 19mm spindle cranks, this bottom bracket provides sealed bearing performance with distinctive aesthetic appeal. Full 6061-T6 construction with precision machining for reliable interface between frame and cranks.

Key Features

• Full CNC-machined 6061-T6 aluminum – Precision-machined from heat-treated alloy for accurate tolerances, smooth bearing fit, and durability
• Unique CNC detailing – Decorative machined features add visual interest to an otherwise hidden component
• Polished finish – Mirror-polished aluminum provides premium appearance and corrosion resistance
• 19mm spindle compatibility – Designed for cranks with 19mm diameter spindles—common on many mid-level and aftermarket BMX cranks
• Mid BB standard – Fits frames with mid bottom bracket shells (68-73mm wide, 34mm internal diameter)
• Multiple color options available – Black, red, purple, pink, polished, and rainbow anodized finishes (polished version specified)

Technical Specifications

• Brand: Colony
• Type: Mid bottom bracket
• Spindle size: 19mm
• Material: 6061-T6 aluminum, CNC-machined
• Finish: Polished
• Shell compatibility: Mid BB (68-73mm shell width, 34mm ID)
• Bearing type: Sealed cartridge bearings (typically included)
• Weight: Lightweight (specific weight not provided)
• Colors available: Black, red, purple, pink, polished, rainbow
• Includes: Bottom bracket cups, bearings, spacers (verify complete kit contents)

Compatibility and Ideal Use Cases

This bottom bracket fits frames with mid BB shells (68-73mm width, 34mm internal diameter)—the most common BMX bottom bracket standard. It will NOT fit American (one-piece crank), Spanish, or Euro bottom bracket shells. The 19mm spindle size works with cranks that have 19mm diameter spindles—verify your crank's spindle diameter before ordering. Cranks with 22mm or 24mm spindles require different bottom brackets (Colony offers 22mm version separately). Installation requires a bottom bracket tool compatible with mid BB cups—typically a 16-notch BB tool or specific spanner wrench depending on cup design. Ideal for riders upgrading worn bottom brackets, building custom bikes, or adding subtle style details with polished finish and CNC machining. The sealed bearing design reduces maintenance and provides smooth, consistent performance compared to loose ball bearing systems. Best suited for street, park, and freestyle BMX where the mid BB standard is most common. The polished finish shows fingerprints and scratches more readily than anodized colors—handle with clean hands during installation and expect natural patina development over time. Multiple color options allow coordination with other polished or anodized components for cohesive build aesthetics.