Box One M30-M Crankset

Box Two Chainring

Product Overview

The Box Two chainring is a precision-manufactured sprocket engineered for competitive BMX racing. The 6061-T6 aluminum construction with lightweight cutouts delivers exceptional stiffness-to-weight ratio while maintaining perfect roundness and true engagement across all tooth positions.

Key Features

• 6061-T6 aluminum alloy - Aerospace-grade aluminum provides superior strength and precision compared to standard alloys; material properties ensure consistent performance across extended use
• Made in the USA - Domestically manufactured quality ensures consistent production standards and material traceability; supports local manufacturing standards
• 104 BCD four-bolt compatibility - Standard modern crank spider pattern compatible with most contemporary BMX cranks; proven attachment system without adapter hardware
• 3/32" chain compatible - Standard BMX chain width works with any 3/32" single-speed chain without compatibility concerns
• Black anodized finish with laser-etched graphics - Professional corrosion-resistant finish maintains appearance and performance in wet conditions; laser-etched branding provides durability without paint degradation
• Optimized for stiffness - Engineering emphasis on rigidity reduces flex under pedaling load; minimizes energy loss and improves power transfer efficiency
• Lightweight cutouts - Strategic material removal reduces weight without sacrificing structural integrity; competitive weight advantage without compromising durability
• 3.5mm thickness - Precision thickness balances strength and weight for optimal racing performance
• Available tooth counts - 38T through 45T range accommodates various gear ratio preferences and riding styles without custom ordering
• Precision roundness and trueness - CNC manufacturing ensures perfect tooth alignment and consistent engagement across all sprocket positions

Technical Specifications

• Type: BMX chainring
• BCD: 104mm four-bolt
• Material: 6061-T6 aluminum alloy
• Origin: Made in USA
• Thickness: 3.5mm
• Chain compatibility: 3/32" standard BMX chain
• Finish: Black anodized with laser-etched graphics
• Tooth count options: 38T-45T
• Weights by tooth count:
  • 38T: 73g (2.57oz)
  • 39T: 78g (2.75oz)
  • 40T: 79g (2.78oz)
  • 41T: 84g (2.96oz)
  • 42T: 87g (3.07oz)
  • 43T: 90g (3.17oz)
  • 44T: 92g (3.25oz)
  • 45T: 96g (3.38oz)
• Application: BMX racing and performance riding

Compatibility and Ideal Use Cases

Compatible exclusively with 104 BCD four-bolt cranks. Ideal for competitive BMX racers seeking lightweight, precision-manufactured chainring performance. Suitable for high-level BMX racing where gear ratio customization and weight optimization matter. The wide tooth count range (38T-45T) accommodates different riding disciplines and speed preferences without committing to single ratio. Works with any standard 3/32" BMX single-speed chain. Recommended for competitive racers, performance-focused builders, and anyone prioritizing USA-manufactured precision chainring construction with aerospace-grade materials and racing-optimized stiffness engineering.

Shipping is often faster, but some items like this one can take 1–3 weeks to ship.