Aro de MTB de carbono de 29" 28mm — Sin gancho, listo para tubelizar | Bola
Aro de MTB de carbono de 29" 28mm — Sin gancho, listo para tubelizar | Bola
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Llanta de carbono hookless Bola MTB34-C23-29 de 29": un aro de 28 mm de ancho interno y 23 mm de perfil bajo (300-375 g) diseñado para XC y trail ligero.
Diseñada para el cronómetro, lista para el singletrack: el modelo MTB34-C23-29 combina un perfil bajo de 23 mm con un canal interno de 28 mm para obtener una forma de neumático más redondeada y una aceleración rápida. Tres tipos de laminado te permiten ajustar los gramos para el día de la carrera de XC.
Guía de compra.
Nivel de peso - Ultraligero ~300g: la construcción para XC competitivo: el laminado más ligero para las subidas en días de carrera, con un margen de impacto más reducido.
Nivel de peso - Superligero ~330g: el equilibrio entre carrera y entrenamiento: gramos adicionales para el abuso diario sin renunciar a la velocidad de XC.
Nivel de peso - Estándar ~375g: la construcción de larga duración grado Light: elígela para resistencia y entrenamiento exigente, donde la durabilidad es lo que cuenta.
Neumático y terreno: el canal estrecho optimiza neumáticos hookless de 2.1-2.4" compatibles con ETRTO; diséñala para XC y trail ligero; un ancho mayor a 2.4" añade agarre pero resta velocidad.
De la misma familia: este es el aro de 29" para XC/trail ligero más estrecho y de menor perfil; los modelos asimétricos de 27 mm y 30 mm ofrecen una mayor capacidad para trail.
El diseño hookless requiere neumáticos tubeless compatibles con ETRTO; clasificada para un peso total del sistema de 110 kg.
Público objetivo y notas de uso.
Carreras de XC, trail ligero y resistencia.
No apta para enduro/DH ni para ciclistas de más de ~100 kg.
Peso máximo del sistema 110 kg en la tabla de especificaciones.
Solo para disco.
La experiencia que te espera.
Apúntala hacia la salida de XC y siente cómo cobra vida: un aro estrecho y bajo que acelera rápido y rueda por el singletrack como si hubiera estado esperando todo el invierno. Solo para tubeless ETRTO, lo que garantiza un ajuste limpio y una conducción flexible a presiones de carrera. Elige un laminado y móntala; la garantía de 3 años en el aro significa que tú te concentras en la trazada, no en la llanta.
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- Material: Toray carbon fiber
- Rim depth: 23mm
- External width: 34mm
- Internal width: 28mm
- Size: 29er
- Profile: U-shaped
- Weight Tier: Standard (375g), Superlight (330g), Ultralight (300g)
- Max Tire Pressure: 75 psi
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- Weight vs Durability: Three weight grades—Standard 375g, Superlight 330g, Ultralight 300g—allow riders to choose between rotational weight savings and impact tolerance. The Ultralight version is 20% lighter than Standard but reduces impact resistance, making it ideal for race-day XC rather than rocky trails.
- Tire Volume vs Speed: The 28mm inner width supports 2.1–2.4" tires, optimizing traction and pinch-flat resistance at lower pressures, but this wide stance adds rolling resistance compared to narrower rims that favor speed on smooth terrain.
- Stiffness vs Compliance: The 23mm profile is designed for responsive steering and lateral stiffness, but the low height reduces vertical compliance, transmitting more trail chatter to the rider on rough sections.
- Versatility vs Specialization: The rim is specifically engineered for XC and light trail use within a 100kg rider weight limit, trading the all-mountain durability of heavier rims for a competitive weight advantage that suits race-focused riders.
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- Fatigue Test: 750,000 cycles @640N (ISO 4210-7 Annex A, informative only)
- Impact Resistance: >40J (ISO 4210-7 reference)
- Flatness: <0.25mm (internal QC)
- Roundness: <0.3mm (internal QC)
- Max Spoke Tension: >300kg (internal QC)
- Ultimate Strength: >100kg (internal QC)
- Dynamic Equilibrium: <3g (internal QC)
- Radial Stiffness: 90–110 N/mm (internal lab)
- Lateral Stiffness: ≥8N/mm
- Max System Weight: 110kgs
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- Cross-Country Racing: Excellent. Ultralight and Superlight options reduce rotational weight for climbing and acceleration.
- Light Trail Riding: Suitable. Standard weight option adds durability for varied trails, but the rim is not designed for aggressive downhill.
- Endurance Rides: Good. Low profile and tubeless setup reduce fatigue over long distances.
- Training / Daily Riding: Suitable. The 28mm inner width provides stable tire support for daily training, but the hookless design limits tire pressure to 65 psi.
- Not Recommended For: Not recommended for enduro or downhill riding, or for riders exceeding 100kg, as the rim's impact tolerance is optimized for XC conditions.
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- Frame Compatibility: 29er (ISO 622mm) mountain bike frames
- Tire Type: Tubeless ready, hookless, ETRTO-compliant tubeless tires
- Tire Width Range: 2.1-2.4" (53-61mm)
- Brake Standard: Disc brake only
- Drivetrain: Hub-dependent (rim does not affect drivetrain)
- Rotor Standard: Hub-dependent
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| MTB34-C23-29 | N/A | N/A | N/A | 300-375g | 23mm | 28mm | see store |
| XC Carbon Rim | N/A | N/A | N/A | ~350g | 25mm | 28mm | ~$700 |
| Trail Carbon Rim | N/A | N/A | N/A | ~380g | 25mm | 30mm | ~$650 |
| All-mountain Carbon Rim | N/A | N/A | N/A | ~400g | 30mm | 30mm | ~$750 |
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What is the recommended tire pressure for the Bola MTB34-C23-29 rim?
The hookless design limits tire pressure to 45–65 psi. For most XC riders, we recommend starting around 30-35 psi for mountain bike tires, but the rim's hookless bead requires ETRTO-compliant tubeless tires. Always check the tire manufacturer's recommended pressure range for the specific tire width, and adjust based on rider weight and terrain. The 28mm inner width supports 2.1–2.4" tires, which typically perform best at lower pressures for traction and comfort.
What tire sizes are compatible with this rim?
The 28mm inner width is optimized for tires between 2.1" and 2.4" (53–61mm). This range ensures a rounder tire profile and improved cornering traction. Using tires outside this range may affect performance or risk pinch flats. Always use tubeless tires that meet ETRTO hookless standards.
How much weight can I save compared to an alloy rim?
The rim comes in three weight grades: Standard (375±15g), Superlight (330±10g), and Ultralight (300±10g). Compared to a typical alloy MTB rim of similar width (which often weighs 450-550g), you can save 75–200g per rim, significantly reducing rotational weight. This translates to faster acceleration and easier climbing. The Ultralight option offers the most savings but with reduced impact tolerance.
What custom build options are available?
Spoke hole diameter (standard 4.5mm), valve hole (6.5mm), assembly hole (7.5mm), and nipple direction (left 5° / right 7°) can be configured to suit your wheelbuilder and hub. The ERD is 592mm, so you can calculate spoke lengths precisely. It is recommended to have an experienced wheelbuilder with carbon rim handling experience.
How do I maintain and inspect the rim?
Regularly check for cracks, delamination, or impact damage, especially after hard rides. Clean the rim with mild soap and water; avoid harsh solvents. Torque spoke nipples to the recommended tension (greater than 300kg rating). Ensure the tubeless sealant is refreshed every 3-6 months. The rim is rated for riders up to 100kg when built to specification, so exceeding that could void the warranty.
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