The Reserve 28|XC Carbon Fibre Rim is the foundation of a World Cup-winning wheelset, offered here for custom builders and riders looking to upgrade their existing hubs.
This ultralight rim is the culmination of years of elite-level competition data, engineered to be stiff, strong, and highly compliant where it matters most on modern Cross-Country and 'Downcountry' race tracks.
At a mere 385 g (nominal), this rim features a 28 mm internal width, providing optimal support for contemporary XC tyres (from 2.2" to 2.5"). This wide stance increases tyre volume and improves the tyre's profile, leading to enhanced stability and cornering grip at lower pressures. The innovative, shallower profile and Asymmetrical Design (with a 2.8 mm offset) are key to its strength, balancing spoke tension for a stiffer, more reliable build. At the same time, the low depth adds vertical compliance to absorb trail buzz.
Key design details include externally reinforced spoke holes and a redesigned 'Step-in' rim bed, which dramatically eases the notoriously fiddly process of tubeless tyre installation and ensures secure bead retention. When building your dream wheelset, you can rest assured knowing the Reserve 28|XC rim is backed by Reserve’s market-leading, transferable Lifetime Warranty with no rider weight limit. This rim is your starting point for a professional-grade, custom-built wheel.
Rim-Only Option: Ideal starting point for a bespoke, performance XC or Downcountry wheel build.
Ultralight Race Weight: Single rim weighs approximately 385 g.
Optimum Tyre Interface: 28 mm internal width supports modern 2.2" to 2.5" tyres for superior traction.
Lifetime Warranty: Unparalleled confidence with a lifetime guarantee and no rider weight limit.
Advanced Carbon Layup: Features reinforced spoke holes for critical strength without unnecessary mass.
Asymmetrical Design: 2.8 mm offset for balanced spoke tension, increasing stiffness and durability.
Easy Tubeless Setup: Redesigned 'Step-in' rim bed facilitates easy tubeless tyre seating and bead retention.
| Feature | Specification | Notes |
| Product Type | Carbon Rim Only | For custom wheel building. |
| Intended Use | Cross-Country (XC) Racing and Riding | Engineered for high-speed, demanding XC and Downcountry use. |
| Wheel Size | 29�Inches | Only available in 29�inch. |
| Rim Material | Carbon Fibre | High-grade carbon with targeted reinforcement. |
| Rim Type | Hookless, Tubeless Ready | Optimised for tubeless performance. Requires tubeless rim tape and valve (often included with rim). |
| Internal Rim Width | 28�mm | Recommended for 2.2"�to�2.5" tyres. |
| Rim Depth | 20�mm | Low profile design for added vertical compliance. |
| Asymmetric Offset | 2.8�mm | Promotes more balanced spoke tension across the wheel. |
| Effective Rim Diameter (ERD) | 595�mm�or�597�mm | Critical measurement for determining spoke length (check with your wheel builder for precise figure). |
| Recommended Spoke Count | 24 Hole | Designed to be built with 24 spokes (24h). |
| Recommended Spoke Tension | 100�-�120�kgf | Tight side tension (check full technical manual for build details). |
| Rim Weight (Nominal) | 385�Grams | Lightweight figure for elite-level XC racing. |
| Brake Compatibility | Disc Brake Only | Designed exclusively for disc brake use. |
| Max Rider Weight | No Limit | Unrestricted rider weight limit, backed by the Lifetime Warranty. |
| E-Bike Compatible | No | Not recommended for use on E-Mountain Bikes. |
| Feature | Specification |
| Product Type | Carbon Rim Only |
| Intended Use | Cross-Country (XC) Racing and Riding |
| Wheel Size | 29�Inches |
| Rim Material | Carbon Fibre |
| Rim Type | Hookless, Tubeless Ready |
| Internal Rim Width | 28�mm |
| Rim Depth | 20�mm |
| Asymmetric Offset | 2.8�mm |
| Effective Rim Diameter (ERD) | 595�mm�or�597�mm |
| Recommended Spoke Count | 24 Hole |
| Recommended Spoke Tension | 100�-�120�kgf |
| Rim Weight (Nominal) | 385�Grams |
| Brake Compatibility | Disc Brake Only |
| Max Rider Weight | No Limit |
| E-Bike Compatible | No |
| Feature | Notes |
| Product Type | For custom wheel building. |
| Intended Use | Engineered for high-speed, demanding XC and Downcountry use. |
| Wheel Size | Only available in 29�inch. |
| Rim Material | High-grade carbon with targeted reinforcement. |
| Rim Type | Optimised for tubeless performance. Requires tubeless rim tape and valve (often included with rim). |
| Internal Rim Width | Recommended for 2.2"�to�2.5" tyres. |
| Rim Depth | Low profile design for added vertical compliance. |
| Asymmetric Offset | Promotes more balanced spoke tension across the wheel. |
| Effective Rim Diameter (ERD) | Critical measurement for determining spoke length (check with your wheel builder for precise figure). |
| Recommended Spoke Count | Designed to be built with 24 spokes (24h). |
| Recommended Spoke Tension | Tight side tension (check full technical manual for build details). |
| Rim Weight (Nominal) | Lightweight figure for elite-level XC racing. |
| Brake Compatibility | Designed exclusively for disc brake use. |
| Max Rider Weight | Unrestricted rider weight limit, backed by the Lifetime Warranty. |
| E-Bike Compatible | Not recommended for use on E-Mountain Bikes. |