Box Three Pro Rear 10mm 36H Hub Black

Product Overview The Box Three Pro is an affordable yet feature-rich 36-hole rear hub engineered for BMX racers seeking reliable performance without premium pricing. The 120-tooth engagement system delivers crisp, immediate power transfer during acceleration. Precision sealed bearings and cold-forged aluminum construction provide durability across racing and training. The 10mm chromoly axle with HG freehub body compatibility offers versatile drivetrain options.

Key Features

• 120-Tooth Engagement System – High-ratchet count provides immediate engagement with minimal freewheeling lag; delivers responsive power transfer during gate starts and acceleration
• 4-Pawl Design – Four-pawl engagement system ensures redundancy and consistent ratcheting across extended riding sessions
• Precision Sealed Bearings – Sealed cartridge bearings eliminate water and dirt ingress; reduce maintenance and extend hub life compared to loose-ball designs
• Cold-Forged 6061-T6 Aluminum Hubshell – Lightweight yet durable aluminum resists corrosion; cold-forging strengthens material without adding weight
• Chromoly Steel Axle and Driver – Cr-Mo construction resists bending and cracking; provides superior strength for competitive racing
• CNC-Machined Components – Precision machining ensures exact tolerances and perfect bearing alignment; reduces play and maximizes smooth operation
• Straight Flanges – Clean, efficient spoke flange design optimizes spoke angles for strong wheel builds
• HG Freehub Body Compatibility – Works with Shimano-standard HG freehub bodies and cassette cogs (16T, 17T, 18T, etc.)
• Anodized Finish with Laser-Etched Graphics – Protective anodized coating resists corrosion; laser graphics won't peel or fade

Technical Specifications

• Wheel Position: Rear
• Spoke Holes: 36
• Hubshell Material: 6061-T6 Aluminum (cold-forged, CNC-machined)
• Axle Material: Chromoly steel (CNC-finished, 10mm diameter)
• Axle Length: 110mm
• Driver Material: Chromoly steel (CNC-finished)
• Engagement System: 4-pawl on 120-tooth ratchet
• Bearings: Sealed cartridge (2 per side)
• Flange Design: Straight
• Freehub Body: HG (Shimano-standard)
• Bolt Standard: 3/8" (10mm)
• Finish: Anodized with laser-etched graphics
• Weight: 435g (15.3 oz)
• Hardware: Steel bolts and caps

Compatibility and Ideal Use Cases

• Fits: 36-hole rear wheel builds on BMX frames with 3/8" (10mm) bolt dropouts; standard BMX frame compatibility
• Cog Compatibility: Any Shimano-standard HG freehub cog (Excess, Elevn, Shimano, etc.); 16T, 17T, 18T options available
• Best For: Budget-conscious BMX racers prioritizing reliable engagement and performance; riders seeking lightweight, durable rear hub without premium pricing
• Ideal Riders: All skill levels; competitive racers on a budget; riders performing high-volume training
• Wheel Building: Requires 36-hole rim, spokes, and nipples to complete rear wheel assembly
• Not Recommended For: Riders requiring ultra-lightweight construction; those needing specific engagement systems beyond 120-tooth standard

Performance Notes The 120-tooth engagement system delivers crisp, responsive power transfer essential for competitive gate-start racing. Four-pawl redundancy ensures consistent engagement even if one pawl wears—full function maintained with partial wear. Sealed bearings reduce rolling resistance and extend service intervals compared to loose-ball designs.

Durability and Value Cold-forged aluminum hubshell and chromoly axle/driver provide excellent strength-to-weight ratio at affordable price point. Sealed bearings require no regular maintenance or greasing. CNC-machined components ensure precision tolerances and long-term reliability across extended racing and training use.

Maintenance Notes Sealed bearings need no regular servicing; hub lifespan extends across multiple racing seasons with minimal care. If engagement becomes sluggish or delayed, pawl and spring components can be serviced separately without full hub replacement. Check bearing play periodically; smooth rotation without wobble indicates proper function.