Excess XLS Carbon Rim 451x21mm 36H With Brake Surface

Product Overview The Excess XLS Carbon is a 36-hole 20" BMX rim engineered from 3K carbon weave for maximum strength-to-weight efficiency. The machined brake track delivers consistent stopping power for V-brake setups equipped with carbon-specific brake pads. At 289g, it offers significant weight savings over alloy alternatives while maintaining the stiffness and durability demanded by competitive BMX racers. Tubeless-ready construction enables modern lightweight tire setups.

Key Features

• 3K Carbon Weave Construction – Three-directional carbon fiber weave provides superior strength and stiffness-to-weight ratio compared to single-directional or alloy construction; reduces rotational mass for acceleration
• Optimized Carbon Geometry – Strategic carbon placement in high-load areas maximizes strength while minimizing weight; undercoat finish protects carbon and provides clean aesthetic
• Machined Brake Track – Precision-finished braking surface on rear profile ensures consistent pad contact; requires carbon-specific brake pads to prevent rim damage and maintain stopping power
• Low-Profile Design – Minimized rim height reduces drag and rotational mass; beneficial for acceleration and sprint performance in racing
• High-Gloss Finish – Premium aesthetic with protective coating; resists UV degradation and maintains appearance through extended use
• Angled Nipple Holes – Spoke openings optimized for direct spoke-to-nipple angle, improving load distribution and wheel rigidity
• Tubeless Ready System – Bead lock system enables tubeless tire setups; reduces rotational weight and allows sealant-based puncture repair with tubeless-specific tires and additional components
• V-Brake Compatible – Designed for V-brake rear wheel setups with mandatory carbon-specific brake pad requirement

Technical Specifications

• Wheel Size: 20" (451mm ETRTO)
• Width: 22mm external / 16mm internal
• Height: 23.3mm
• Spoke Holes: 36 (drilled)
• Material: 3K carbon weave
• Rim Profile: Carbon brake-track design (rear)
• ERD (Effective Rim Diameter): 423.4mm
• Valve: Presta F/V
• Finish: High-gloss with undercoat protection
• Weight: 289g
• Recommended Spoke Tension: ≤115 KGF
• Maximum Tire Pressure: 110 PSI (7.58 bar)
• Tubeless Ready: Yes (requires additional tubeless conversion components: special valve, sealant, rim tape, liquid sealer)
• Brake Surface: Machined for V-brake compatibility (carbon-specific pads required)

Compatibility and Ideal Use Cases

• Fits: 20" BMX bikes with 36-hole hubs; rear wheel position with V-brake systems only
• Brake Pad Requirement: Carbon-specific brake pads mandatory—standard aluminum brake pads will damage rim and void warranty; incompatible pads reduce stopping power and compromise safety
• Tire Compatibility: 20"x1-1/8" or 20"x1-3/8" BMX tires; tubeless-specific tires with proper rim tape and sealant for tubeless setup; maximum inflation 110 PSI
• Best For: Advanced BMX racers prioritizing ultra-lightweight performance; competitive riders on hard-pack tracks seeking weight advantage
• Ideal Riders: Expert-level 20" racers; riders valuing weight savings and stiffness; those with carbon-brake-pad availability and proper maintenance discipline
• Wheel Building: Requires 36-hole rear hub, spokes, and nipples to complete rear wheel assembly; professional wheel building recommended due to carbon's brittleness
• Not Recommended For: Riders without access to carbon-specific brake pads; front wheel use; riders exceeding 110 PSI tire pressure; rough or loose track surfaces; beginners unfamiliar with carbon care

Brake Pad Critical Requirement This rim requires carbon-specific brake pads. Standard aluminum brake pads create excessive friction and heat, causing rim damage, loss of braking power, and potential rim failure. Verify carbon pad availability before purchase and replacement.

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 and Care Notes Carbon rims require careful handling to prevent impact cracks. Spoke tension should be maintained at or below 115 KGF to prevent rim stress. Check wheel trueness before each race. Do not exceed 110 PSI tire pressure. Store and transport rim carefully to avoid impact damage. Carbon is susceptible to cracking from direct impacts; inspect regularly for damage.

EXCESS XLS 451x21MM RIM SPECIFICATIONS
ERD: 20": 423.4mm
Height: 23.3mm
Internal Rim Width: 16mm
External Rim Width: 22mm
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.