Box One Oversized 20mm Rear Lockring

Product Overview The Box One Oversized 20mm Rear Lockring is a CNC-machined aluminum lockring designed to secure rear cogs on 20mm ISO-standard rear hubs. At just 8g, it delivers significant weight savings over traditional steel lockrings while maintaining durability. Compatible with standard bottom bracket tools, it installs quickly on Box and other ISO-equipped rear hubs.

Key Features

• 6061-T6 Aluminum Construction – Lightweight material reduces rotational mass without compromising cog retention strength; resists corrosion better than steel
• CNC-Machined Precision – Computer-finished notches ensure perfect tool engagement and consistent clamping force; eliminates stripped or cross-threaded installations
• Anodized Finish with Laser-Etched Graphics – Protective anodized coating resists corrosion; laser etching provides clean branding without paint or adhesives that can wear off
• Park Tool BBT-9 Compatible – Works with Park Tool BBT-9 and other 44mm, 16-notch bottom bracket tools; multi-tool design ensures compatibility across most mechanic toolkits
• Lightweight Upgrade – Saves approximately 5g versus standard steel lockrings; minimal weight savings but aids overall bike lightening on competitive builds

Technical Specifications

• Material: 6061-T6 Aluminum
• Finish: Anodized with laser-etched graphics
• Thread Pitch: 1.72 x 24 TPI
• Outer Diameter: 55.5mm
• Compatible Tool: Park Tool BBT-9 (44mm, 16-notch bottom bracket tool)
• Weight: 8g (0.28 oz)
• Manufacturing: CNC-machined

Compatibility and Ideal Use Cases

• Fits: 20mm ISO rear hubs (Box One, Excess ISO Pro, and other ISO-standard rear hubs) with 1.72 x 24 TPI threads
• Tool Requirement: Park Tool BBT-9 or similar 44mm, 16-notch bottom bracket tool for installation and removal
• Best For: BMX racers and competitive riders seeking lightweight component upgrades; anyone replacing worn or damaged steel lockrings
• Ideal Riders: Race-focused builders optimizing bike weight; riders using Box One complete rear hub setups
• Not Recommended For: Non-ISO rear hub standards or alternative thread pitches—verify thread compatibility before purchase

Installation Note Requires Park Tool BBT-9 or equivalent bottom bracket tool for proper installation. Do not over-tighten; hand-tight plus a quarter turn is sufficient to secure the cog.