Excess XLS Alloy Rim OS20 451x28mm 36H With Brake Surface

Product Overview The Excess XLS OS20 is a 36-hole 20" BMX rim engineered with double-walled 6061-T6 aluminum and optimized internal geometry for lightweight performance with strength. The "OS20" oversized designation indicates enhanced tubing in high-stress areas without proportional weight gain. The machined brake track delivers consistent stopping power for V-brake or mechanical disc-brake setups. At 359g, it balances speed with durability for competitive racing and training.

Key Features

• Double-Wall 6061-T6 Aluminum Construction – Two-layer rim structure increases stiffness without proportional weight gain; resists denting and impact damage common in racing
• Optimized Internal Geometry – Strategic material placement reduces weight in non-critical areas while maintaining strength where needed; achieves efficient weight-to-stiffness ratio
• Oversized Profile (OS20) – Enhanced tubing geometry in high-stress zones increases lateral stiffness and impact resistance; delivers strength of a wider rim without excessive weight
• Angled Nipple Holes – Slightly angled spoke openings create more direct spoke-to-nipple angles, improving load distribution and reducing lateral stress during wheel building and riding
• Machined Brake Track – Precision-finished braking surface ensures consistent pad contact and superior stopping power; critical for reliable braking modulation
• Low-Profile Aero Design – Minimized rim height reduces drag and rotational mass; beneficial for acceleration and sprint performance in racing
• Polished and Black Anodized Finish – Single-process polishing and anodizing provides durable corrosion protection and clean aesthetic; resists fading and wear
• Tubeless Ready System – Features bead lock system for tubeless tire compatibility; reduces rotational weight and enables sealant-based puncture repair with tubeless-specific tires and additional components
• V-Brake Compatible – Brake track design supports traditional V-brake systems on rear wheel setups

Technical Specifications

• Wheel Size: 20" (451mm ETRTO)
• Width: 28mm external / 23.36mm internal
• Height: 16mm
• Spoke Holes: 36 (drilled)
• Material: 6061-T6 Aluminum
• Rim Profile: Double-walled with machined brake track (OS20 oversized)
• ERD (Effective Rim Diameter): 428.6mm
• Valve: Schrader valve hole
• Finish: Polished, black anodized
• Weight: 359g
• Recommended Spoke Tension: <115 KGF
• Tubeless Ready: Yes (requires additional tubeless conversion components: special valve, sealant, rim tape, liquid sealer)
• Brake Surface: Machined for improved stopping power

Compatibility and Ideal Use Cases

• Fits: 20" BMX bikes with 36-hole hubs; rear wheel position with V-brake or mechanical disc-brake systems
• Tire Compatibility: 20"x1.5" or 20"x1.75" BMX tires; tubeless-specific tires with proper rim tape and sealant for tubeless setup
• Best For: 20" BMX racers and competitive riders seeking lightweight performance with oversized strength; riders balancing speed with durability
• Ideal Riders: Intermediate to advanced 20" racers; riders prioritizing responsive handling and reliable braking on traditional V-brake setups
• Wheel Building: Requires 36-hole rear hub, spokes, and nipples to complete rear wheel assembly
• Not Recommended For: Front wheel position; rim-brake systems other than V-brake; riders exceeding 115 KGF spoke tension

Tubeless Conversion Rim is tubeless-ready but requires additional components for full tubeless setup: tubeless-specific valve, sealant rim tape, liquid sealer, and tubeless-compatible tires. Traditional tube setup works without modifications.

Maintenance Note Spoke tension should be verified periodically and maintained at or below 115 KGF to prevent rim stress and spoke breakage. Check wheel trueness before each race or training session. Angled nipple holes enable strong, rigid wheel builds with proper spoke tension management.

EXCESS XLS 451x28MM RIM SPECIFICATIONS
ERD: 432mm
Height: 16mm
Internal Rim Width: 23.36mm (front)
External Rim Width: 28mm
Spoke tension recommended <115kgf

Tubeless Ready System - Our rims feature a Bead Lock System, needed for the rim to be Tubeless Ready. With the installation of additional items needed you can get the rim ready for tubeless set up, along with the usage of a tubeless specific tire. With a tubeless set up, you can lighten up your wheels, saveing rotational weight, as well as have a sealant inside your tubeless ready tire to help automatically repair small punctures.
Additional items needed to convert to a Tubeless system include Special Valve, Sealant Rim Tape, and Liquid sealer.

V-Braking Compatible - Designed to be used as a rear rim when using a V-brake.