• Bola 700c 45mm Carbon Road Rim – 34mm Outer, 28mm Inner, Tubeless Ready
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Cerchio da strada in carbonio Tubeless 700C da 45mm, larghezza 34/28mm | Bola

Cerchio da strada in carbonio Tubeless 700C da 45mm, larghezza 34/28mm | Bola

$310.00 USD
$350.00 USD $310.00 USD
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Cerchio da strada in carbonio Bola 700C da 45mm - un cerchio per freni a disco da 45mm con profilo a U e gancio, 34mm esterno / 28mm interno, 370-445g, ERD 548, per allestimenti road e gravel con pneumatici larghi.

Un profilo da 45mm, via di mezzo tra aerodinamica e comfort: abbastanza largo per accogliere pneumatici moderni, abbastanza alto per sfidare il vento, abbastanza leggero per le salite.

Guida all'acquisto.

Fascia di peso - leggera ~370g (Ultralight): per salite e accelerazioni con pneumatici larghi e confortevoli.

Fascia di peso - superiore ~445g (Light/Midweight): per gravel accidentato e ciclisti più pesanti, sacrificando un po' di peso in favore della resistenza.

Larghezza interna - 28mm: 33-40mm a ~55-75 PSI per strada e gravel veloce, 40-48mm a ~40-60 PSI per superfici miste accidentate.

Serie con stessa altezza: il cerchio gravel asimmetrico da 45mm ($310) presenta un canale più stretto da 24-25mm; il cerchio da 45mm 36/30mm ($320) è ancora più largo.

Altezze adiacenti: il cerchio da 50mm 34/28mm ($310) aggiunge vantaggi aerodinamici; questo cerchio da 45mm rimane più leggero e stabile.

Solo per montaggi con freni a disco; rispettare il limite di peso del sistema.

Target di riferimento e note sull'utilizzo.

Ciclisti all-road, gravel ed endurance e assemblatori di ruote.

Telai per freni a disco; foratura 20/20, fori valvola/raggi personalizzabili.

PSI massimi e limite ciclista come da tabella delle specifiche.

L'esperienza di guida che ti attende.

Montato tubeless con uno pneumatico da 40mm risulta straordinariamente versatile: un impulso aerodinamico veloce sull'asfalto, un comfort stabile sullo sterrato, tutto in un'unica ruota.

Ti chiede dove vuoi andare.

Spedizione gratuita e 3 anni di garanzia sul cerchio a supporto dell'assemblaggio.

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  • Materiale: Toray carbon fiber
  • Altezza: 45mm
  • Larghezza esterna: 34mm
  • Larghezza interna: 28mm
  • Misura: 700c
  • Profile: hooked U-profile, Tubeless-ready
  • Peso Tier: 370-445g
  • PSI massimo: 90
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  • Aero vs Climbing: With a 45mm profile, this rim offers noticeable aerodynamic gains on flat and rolling terrain, but its 370-445g Peso range (depending on build grade) is not the lightest for steep climbs. Riders prioritizing Peso savings for climbing may prefer shallower rims, but the aero benefit rewards sustained speeds.
  • Stiffness vs Compliance: The 28mm inner width allows running wider tires at lower pressures, improving comfort and traction without adding excessive flex. Carbon construction and high-modulus fibers maintain stiffness for efficient power transfer, though some riders may find it firmer than alloy rims over rough roads.
  • Tire Volume vs Speed: With an inner width of 28mm and outer of 34mm, this rim supports 25-32mm tires, enabling high-volume setups that reduce rolling resistance on mixed surfaces. While wider tires can slightly increase aerodynamic drag, the improved grip and stability often outweigh the speed penalty on climbs or rough pavement.
  • Crosswind vs Aero: The 45mm Altezza strikes a balance between aerodynamics and crosswind stability. Compared to deeper rims (50mm+), it is more manageable in gusty conditions while still providing a meaningful aero advantage. The handling characteristics are predictable, making it suitable for varied terrain.
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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 Raggio 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 Peso: 110kgs
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  • Climbing / Hill Repeats: Suitable
  • Gran Fondo / Endurance: Excellent
  • Road Racing: Good
  • Sprinting / Criterium: Good
  • Training / Daily Riding: Excellent
  • Not Recommended For: Not recommended for aggressive off-road or trail use
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  • Frame Compatibility: 700c (ISO 622mm BSD) compatible frames, disc Freno only
  • Tire Type: Tubeless ready clincher
  • Tire Width Range: 33-48mm
  • Freno Standard: Disc Freno
  • Drivetrain: Compatible with standard road drivetrains
  • Rotore Standard: Disc Freno compatible
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Bola 45 _ _ _ 370-445g 45mm 28mm vedi negozio
Hyper 45 _ _ _ 430g 45mm 28mm ~$600
IC45 _ _ _ 420g 45mm 28mm ~$450
Drive 45 _ _ _ 440g 45mm 28mm ~$500
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What is the recommended tire width range for this rim?

The rim supports 25-32mm tubeless tires. The 28mm inner width provides a stable platform for wider tires, allowing lower pressures for comfort and traction. The 34mm outer width complements modern tire shapes for improved handling.

Can this rim be set up tubeless?

Yes, the rim is tubeless-ready with a hooked U-profile. Use tubeless valves and sealant. The 6.5mm valve hole accommodates standard valves. Ensure the rim tape is installed correctly to maintain an airtight seal.

What is the weight of the rim?

The verified weight ranges from 370g to 445g depending on the build grade. This makes it a versatile option for both climbing and endurance riding. The manufacturing tolerances ensure consistent weight across rims.

What are the custom build options?

The rim is available in different build grades, and the valve hole and spoke hole sizes are customizable: 6.5mm valve hole and 4.5mm spoke hole. ERD is 548mm, so builders can select appropriate spokes for custom wheel builds.

How do I maintain and inspect the rim?

Regularly inspect for cracks, delamination, or impact damage. Check spoke tension and true the wheel if needed. The rim has passed tests for forward compression >300kg, lateral torsion >50kg, and spoke tension >280kg, but regular maintenance is still essential for longevity.

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