Box Hex Lab Carbon 20" Rim 406mm 36H

Product Overview The Box Hex Lab Carbon is a 20" BMX rim engineered with Ultra High Modulus carbon fiber and Oversized Technology for maximum steering and pedaling stiffness. Available in brake-ready (rear) and brake-less (front) profiles, it's tubeless-compatible and designed to transfer power and control directly to the ground with minimal latency. The Symmetrical Dihedral Angle Stabilizers provide the stiffness and durability of a wider rim profile without excess weight.

Key Features

• Ultra High Modulus Carbon Fiber – Higher stiffness-to-weight ratio than standard carbon variants; provides responsive handling and power transfer with reduced flex during tricks and high-load movements
• Symmetrical Dihedral Angle Stabilizers – Sculpted bullet-shaped spoke beds bridge the angled rim flanks to the vertical plane, achieving wide-rim stiffness without the weight penalty of a full wide-profile design
• Machined Brake Track (Rear) – Precision-finished braking surface ensures consistent pad contact and smooth modulation; rear model includes brake track; front model is brake-less
• Tubeless Ready – Compatible with both traditional tubed and modern tubeless tire setups, expanding tire and pressure options
• 36-Hole Configuration – Standard spoke count for maximum load distribution and spoke redundancy
• 30mm Internal Rim Width – Optimized for 20" BMX tire compatibility while maintaining structural rigidity
• Foil Stamped Chrome Logos – Durable graphic finish that won't fade or peel under UV exposure

Technical Specifications

• Wheel Size: 20" (406mm ETRTO)
• Spoke Holes: 36 (drilled)
• Material: Ultra High Modulus Carbon Fiber
• Internal Rim Width: 30mm
• ERD (Effective Rim Diameter): 369mm
• Brake Profile: Rear brake-ready or front brake-less
• Brake Track: Machined (rear only)
• Tubeless Compatible: Yes
• Recommended Spoke Tension: 110–115kg (varies per rim)
• Weight: Not specified

Compatibility and Ideal Use Cases

• Fits: 20" BMX bikes with 36-hole hubs; both front and rear wheel positions (select correct profile)
• Brake Pad Requirement: Rear model requires Box Carbon Brake Pad Inserts—standard aluminum brake pads will void warranty and cause brake failure
• Best For: Riders prioritizing maximum stiffness, power transfer, and responsive handling; intermediate to advanced riders who benefit from reduced latency
• Tire Options: Works with standard tubed setups or modern tubeless tire systems
• Ideal Riders: Performance-focused BMX riders seeking high-end component upgrades; those running complete Box Oversized systems for optimal integration

Important Notes Box Carbon rims require carbon-specific brake pads. Use of incorrect brake pads voids warranty. Every rim has slight spoke tension variations; check tension during wheel build and maintain 110–115kg range during maintenance.

FAQ

Q: What is the recommended spoke tension for this rim?
A:We recommend a spoke tension of between 110kg and 115kg; remember, every rim is different.