Cerchio MTB BOLA 29er in carbonio | 40mm esterno, 34mm interno, 30mm
Cerchio MTB BOLA 29er in carbonio | 40mm esterno, 34mm interno, 30mm
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Il cerchio da enduro in carbonio hookless Bola 29er: un cerchio largo con canale interno da 34 mm e profilo da 30 mm in carbonio Toray (410-465 g) per trail aggressivi e all-mountain.
Quando il sentiero si restringe e si profilano giardini di roccia, un cerchio largo ti permette di utilizzare pressioni più basse e avere più grip sul terreno. Questo cerchio Bola 29er abbina un canale interno da 34 mm a un profilo a U hookless da 30 mm per una maggiore sicurezza nell'enduro.
Guida all'acquisto.
Fascia di peso - Superlight ~410g: il cerchio da enduro leggero per scalatori: elimina grammi rotazionali per i lunghi trasferimenti e le fasi di risalita; ideale per i rider più leggeri, con un margine di resistenza agli impatti più sottile.
Fascia di peso - Standard ~465g: la versione di peso medio per una maggiore tolleranza agli impatti: scegli questa opzione per l'enduro aggressivo e per i rider più pesanti che necessitano di un cerchio più robusto sui terreni accidentati.
Pneumatici e terreno: il canale largo ospita coperture da 2.25-2.6" a basse pressioni enduro per un'impronta a terra ampia e resistente alle pizzicature - progettato per enduro e trail aggressivi, non per la leggerezza da XC.
Della stessa famiglia: il cerchio asimmetrico 29er più stretto da 30 mm (~310$) è la scelta più leggera per il trail quando la larghezza da enduro risulta eccessiva; il cerchio 29er Carbon DH 40/32/30 (430$) si posiziona al di sopra per un utilizzo gravity puro.
Certificato per un peso complessivo del sistema fino a 110 kg.
Pubblico di riferimento e note sull'utilizzo.
Rider di enduro e all-mountain e amanti del trail aggressivo.
Peso massimo del sistema 110 kg; solo per freni a disco.
Non è un cerchio specifico da DH.
L'esperienza di guida che ti attende.
Abbassa la pressione dei pneumatici e senti come il cerchio aderisce al terreno: un'impronta a terra ampia e bassa che artiglia le rocce e sfida le pizzicature. Affronta i tratti più tecnici e il tallone hookless manterrà la tenuta, con il cerchio che assorbe le vibrazioni permettendo alla ruota posteriore di seguire esattamente la tua traiettoria. Scegli la stratificazione e assemblalo: una garanzia di 3 anni sul cerchio ti protegge quando il percorso si fa duro.
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- Material: Toray carbon
- Rim depth: 30mm
- External width: 40mm
- Internal width: 34mm
- Size: 29er
- Profile: U-shape hookless
- Weight Tier: Standard 465g, Superlight 410g
- Max Tire Pressure: 75
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- Stiffness vs Compliance: The 30mm rim height offers a balance; it's stiff enough for precise handling but with some vertical compliance for comfort on long descents. The high-modulus Toray carbon layup provides a stiffness-to-weight ratio that suits aggressive riding without harshness.
- Weight vs Durability: Choose standard layup at 465g for enhanced impact resistance or superlight at 410g to save 55g per rim. Both meet the same strength benchmarks (>300kg compressive, >50kg lateral), so the trade-off is primarily rotational mass vs. slight weight reduction.
- Tire Volume vs Speed: The wide 34mm inner width supports 2.25-2.6" tires, increasing traction and stability but adding rolling resistance. Narrower tires would be faster but sacrifice grip on technical trails.
- Versatility vs Specialization: Designed for enduro/all-mountain, this rim handles rough terrain and impacts while remaining light. It's not as specialized as a DH rim (which would be heavier) or an XC rim (which would be narrower and lighter), making it a versatile choice for mixed riding.
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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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- Enduro Racing: Excellent
- All-Mountain: Excellent
- Trail Riding: Good
- Technical Descents: Excellent
- Rough Terrain: Excellent
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- Frame Compatibility: 29er (622mm BSD) rims compatible with most modern 29er mountain bike frames; check clearance for tire width and fork/chainstay spacing.
- Tire Type: Tubeless-ready, hookless bead; use tubeless or tubeless-convertible tires.
- Tire Width Range: 2.25"–2.6"
- Brake Standard: Disc brake only (6-bolt or centerlock rotor not specified; ensure compatible hub)
- Drivetrain: Not specified; compatible with standard MTB drivetrains (e.g., Shimano, SRAM) as it's just a rim.
- Rotor Standard: Not specified; typically 6-bolt or centerlock depending on hub, but rim itself doesn't affect rotor mount.
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|---|---|---|---|---|---|---|---|
| Carbon MTB Rim | N/A | N/A | N/A | 410-465g | 30mm | 34mm | see store |
| M730 | N/A | N/A | N/A | 400g | 30mm | 34mm | ~$1200 |
| 3Zero Moto | N/A | N/A | N/A | 450g | 30mm | 34mm | ~$1000 |
| Control | N/A | N/A | N/A | 430g | 30mm | 34mm | ~$800 |
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How do I set up this rim tubeless?
This rim is hookless and tubeless-ready, so you can use standard tubeless tape and valves. Apply tape across the rim bed, install the valve, mount a tubeless tire, and inflate to seat the bead. Use a sealant like Stan's or Muc-Off. Recommended tire pressure is typically 20-25 psi for enduro, but check tire manufacturer's guidelines. The hookless bead ensures a secure fit without pinch flats.
What tire sizes are compatible?
The 34mm inner width supports 2.25-2.6 inches inflated tire widths. For enduro, a 2.4-2.6 rear and 2.5-2.6 front is common. The wide rim increases air volume and contact patch, improving traction and stability. Always ensure the tire is tubeless-compatible and designed for hookless rims.
How much weight can I save with the superlight layup?
The superlight layup saves approximately 55g per rim compared to the standard (410g vs 465g). This reduces rotational mass, improving acceleration and climbing efficiency. Both layups meet the same strength benchmarks, so the trade-off is minimal. For a set of two rims, you save about 110g, which can be noticeable in acceleration.
Can I build this rim with my own spokes and hub?
Yes, the rim is designed for custom wheelbuilding. With an ERD of 579mm, you can calculate spoke lengths for your chosen hub and lacing pattern (typically 32 spokes for MTB). The rim has a standard nipple seat and is compatible with common spoke nipples. It's recommended to use a high-quality spoke and nipple to maintain tension.
How do I inspect and maintain the rim?
Regularly check for cracks, delamination, or impacts. After hard rides, inspect the rim bed and spoke holes for damage. Clean the rim with mild soap and water, and avoid using harsh chemicals. Ensure spoke tension is even and re-true as needed. The 3-year warranty covers defects but not damage from crashes or misuse.
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