Box One Focus 20" Rim 406×28mm 36h With Brake Surface

Product Overview

The Box One Focus is a lightweight double-wall rim designed for 20" BMX freestyle and street wheels. Built with a low-profile extrusion that removes excess material, this 36-hole rear rim weighs 362 grams and includes a machined braking surface for caliper or U-brake compatibility. Single eyelet construction allows higher spoke tension for improved wheel stiffness and durability.

Key Features

• Double-wall construction – Inner support wall distributes spoke tension and impact loads across the rim structure for improved strength-to-weight ratio

• Single eyelets – Metal inserts at each spoke hole resist spoke pull-through under high tension, allowing tighter wheel builds without rim failure

• Low-profile extrusion – Minimized material in non-structural areas reduces rotational weight without compromising lateral stiffness

• Machined brake surface – Sidewalls are precision-machined to provide consistent braking performance with caliper or U-brake systems

• ENBMX compliant – Meets or exceeds European BMX standards for rim performance and durability

Technical Specifications

• Rim size: 20" × 1.75" (406mm BSD)
• Internal width: 28 mm
• Spoke holes: 36h
• Weight: 362 g (12.7 oz)
• ERD (Effective Rim Diameter): 394 mm
• Material: 6061-T6 alloy
• Wall type: Double-wall with single eyelets
• Brake compatibility: Rear wheel with machined brake surface (caliper/U-brake)
• Color options: Anodized Black, Red, Blue, Gold

Compatibility and Ideal Use Cases

Designed for rear wheels on 20" BMX freestyle, street, or park bikes using rim brakes (caliper or U-brake). The 36-hole drilling provides added spoke support for trick riding and impact landings. Best suited for street, park, and dirt jumping where reliable braking is required. 406mm BSD fits standard 20" × 1.75" to 2.4" tires. Not recommended for disc brake setups—brake surface adds weight unnecessary for disc applications.

Note: US orders ship direct from manufacturer and may arrive separately from other items.