Excess XLS Carbon Rim 451x21mm 28H No Brake Surface

Product Overview The Excess XLS Carbon is a 28-hole 20" brakeless BMX rim engineered from 3K carbon weave for maximum strength-to-weight efficiency. The brakeless front profile works as front or rear rim on modern disc-brake setups, eliminating weight penalties from brake tracks. At 289g, it offers exceptional lightweight performance while maintaining the stiffness and durability demanded by advanced BMX racers. The 28-hole configuration reduces weight further compared to 36-hole versions while maintaining structural integrity.

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 and responsiveness
• Optimized Carbon Geometry – Strategic carbon placement in high-load areas maximizes strength while minimizing weight; undercoat finish protects carbon and provides clean aesthetic
• 28-Hole Configuration – Reduced spoke count decreases weight while maintaining adequate load distribution for 20" racing; ideal for riders prioritizing minimal rotational mass
• Brakeless Front Profile – Designed specifically for disc-brake systems; eliminates brake track weight and complexity; enables clean, minimal rim design
• Low-Profile Aero 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
• Disc-Brake Specific Design – Brakeless profile enables use as both front and rear rim on hydraulic or mechanical disc-brake systems without compromise
• Front or Rear Versatility – Same geometry and strength profile allow use on either wheel position without sacrificing performance or durability

Technical Specifications

• Wheel Size: 20" (451mm ETRTO)
• Width: 22mm external / 16mm internal
• Height: 23.3mm
• Spoke Holes: 28 (drilled)
• Material: 3K carbon weave
• Rim Profile: Brakeless (front/rear disc)
• 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)
• Brake Surface: None (brakeless / disc-brake compatible)

Compatibility and Ideal Use Cases

• Fits: 20" BMX bikes with 28-hole hubs; front or rear wheel positions on disc-brake systems (hydraulic or mechanical)
• Brake System Requirement: Disc brakes only—cannot be used with rim brakes or V-brakes due to lack of brake track
• Tire Compatibility: 20"x1-1/8" or 20"x1-3/8" BMX tires; maximum inflation 110 PSI
• Best For: Advanced BMX racers with disc-brake bikes prioritizing ultra-lightweight performance; competitive riders seeking maximum weight advantage and versatile front/rear compatibility
• Ideal Riders: Expert-level 20" racers; riders running complete disc-brake setups; those valuing weight savings, stiffness, and minimal component complexity
• Wheel Building: Requires 28-hole hub, spokes, and nipples to complete wheel assembly; professional wheel building recommended due to carbon's brittleness
• Not Recommended For: V-brake or rim-brake systems; riders exceeding 110 PSI tire pressure; rough or loose track surfaces; beginners unfamiliar with carbon care; 36-hole hub compatibility

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. Front and rear versatility allows wheel swaps between positions if one requires inspection or repair.

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.

Disc Braking Compatible - Designed to be used as a front rim or a rear rim when using a disc brake.