29er Hookless Carbon MTB Rim – 23mm Profile, 28mm Inner Width, Tubeless Ready, 300–375g
29er Hookless Carbon MTB Rim – 23mm Profile, 28mm Inner Width, Tubeless Ready, 300–375g
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Explore the Advantages of the 29er Carbon MTB Rim
The Bola MTB34-C23-29 is a hookless, tubeless-compatible carbon fiber rim engineered for 29-inch cross-country and trail mountain bikes. At 300–375g per rim depending on layup grade, it offers a verified weight advantage over comparable alloy rims (typically 450–550g) while maintaining structural integrity for riders up to 100kg.
Key Specifications
| Specification | Value |
|---|---|
| Rim Diameter | 29er (ISO 622mm BSD) |
| Rim Profile Height | 23mm (low-profile XC) |
| Inner Width | 28mm |
| Outer Width | 34mm |
| ERD (Effective Rim Diameter) | 592mm |
| Rim Shape | U-shape hookless |
| Weight — Standard | 375 ± 15g |
| Weight — Superlight | 330 ± 10g |
| Weight — Ultralight | 300 ± 10g |
| Tire Pressure Range | 45–65 psi (hookless limit) |
| Max Rider Weight | 100kg |
| Spoke Hole Diameter | 4.5mm (customizable) |
| Valve Hole Diameter | 6.5mm (customizable) |
| Assembly Hole Diameter | 7.5mm (customizable) |
| Nipple Direction | Left 5° / Right 7° (customizable) |
Structural Strength Data
- Forward Compressive Strength: >300kg
- Lateral Torsion Resistance: >50kg
- Spoke Hole Tension: >280kg
- Dynamic Equilibrium (imbalance): <3g
- Flatness Tolerance: <0.15mm
- Roundness Tolerance: <0.3mm
Hookless Design — What It Means for Your Build
Hookless rims omit the traditional bead hook, reducing rim wall mass and enabling a more uniform carbon layup. This design is compatible with tubeless-ready tires that meet ETRTO hookless standards. Important: hookless rims require tubeless-specific tires and are limited to a maximum tire pressure of 65 psi. Clincher tires with inner tubes are not recommended on this rim.
Compatible Tire Widths
The 28mm inner width is optimized for 2.1–2.4 inch (53–61mm) XC and trail tires. This width improves tire casing support, reduces pinch flat risk, and promotes a rounder tire profile for better cornering traction on hardpack and loose terrain.
Weight Grade Options
- Standard (375 ± 15g): Best for trail and endurance riders prioritizing durability over minimum weight.
- Superlight (330 ± 10g): Balanced option for competitive XC riders seeking rotational weight savings without maximum layup risk.
- Ultralight (300 ± 10g): Race-optimized layup for sub-100kg XC racers on groomed or low-impact terrain. Reduced impact tolerance compared to standard grade.
Known Tradeoffs
While the hookless construction saves weight and simplifies layup consistency, it caps maximum tire pressure at 65 psi and requires ETRTO-compliant tubeless tires. Riders requiring pressures above 65 psi or using clincher tires should select a hooked-bead carbon rim instead.
Frequently Asked Questions
- Q: How light should a carbon 29er rim be for competitive XC racing?
- A: Most competitive XC rims weigh between 280–360g. This rim's ultralight grade at 300 ± 10g sits within that range, while the superlight grade (330g) offers a more durable race option.
- Q: Is a 28mm inner width good for tubeless mountain bike tires?
- A: Yes. ETRTO and most tire manufacturers recommend 25–30mm inner width for 2.1–2.4 inch MTB tires. At 28mm, this rim is well-positioned for XC and light trail use.
- Q: What is the difference between hookless and hooked carbon rims?
- A: Hooked rims have a retaining bead that supports higher pressure and is compatible with standard clincher tires. Hookless rims require tubeless-ready tires, limit pressure to 65 psi, and achieve slightly lower rim weight through a cleaner carbon layup.
- Q: Are hookless carbon rims safe for aggressive trail riding?
- A: This rim is rated for riders up to 100kg and supports compressive loads exceeding 300kg. It is suitable for XC and light trail use. For aggressive enduro or downhill terrain with high-impact forces, a taller-profile, heavier-layup rim is recommended.
- Q: Can spoke count and hole diameter be customized?
- A: Yes. Spoke hole diameter (standard 4.5mm), valve hole diameter (6.5mm), assembly hole (7.5mm), and nipple offset angles are all available in custom configurations. Contact the manufacturer with your build specification.
Lightweight Hookless Design for Superior Performance
The 29er carbon MTB rim features a hookless design that significantly reduces weight while enhancing durability. Weighing between 300 and 375 grams, this rim is engineered for riders seeking high performance without sacrificing strength. The absence of hooks not only allows smoother tire seating but also improves impact resistance, making it ideal for rough mountain trails. With a streamlined 23mm profile, the rim optimizes rolling efficiency and provides excellent bike handling, offering riders a competitive edge in various off-road conditions.
Optimal 28mm Inner Width for Tire Compatibility and Stability
With a 28mm inner width, this 29er carbon MTB rim perfectly balances tire volume and sidewall support. This width accommodates a wide range of tire sizes, allowing mountain bikers to customize their setup for different terrains. The wider rim ensures better tire stability at lower pressures, increasing traction and reducing the risk of pinch flats. Enhanced tire support also contributes to improved control and comfort, making it a versatile choice for aggressive trail riding or cross-country adventures.
Tubeless Ready Technology for Improved Ride and Efficiency
This 29er carbon MTB rim comes tubeless ready, enabling seamless installation of tubeless tires. Tubeless setups reduce rolling resistance and allow riders to run lower tire pressures without flats, resulting in better grip and a smoother ride. The rim’s precise bead seat design ensures an airtight seal, simplifying maintenance and tire changes. By eliminating inner tubes, the rim reduces overall bike weight and boosts efficiency, making it an excellent choice for mountain bikers looking for reliability and performance enhancements.
