700C Tubeless 45mm Carbon Road Rim 34/28mm Wide | Bola
700C Tubeless 45mm Carbon Road Rim 34/28mm Wide | Bola
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The Bola 700C 45mm carbon road rim - a 45mm hooked U-profile disc rim, 34mm outer / 28mm internal, 370-445g, ERD 548, for wide-tyre road and gravel builds.
A 45mm middle-voice between aero and comfort - wide enough to swallow modern tyres, deep enough to cheat the wind, light enough to climb.
Buying Guide.
Weight tier - light ~370g (Ultralight): for climbing and acceleration with wide, comfortable tyres.
Weight tier - upper ~445g (Light/Midweight): for rough gravel and heavier riders, trading a little weight for toughness.
Internal width - 28mm: 33-40mm at ~55-75 PSI for road and fast gravel, 40-48mm at ~40-60 PSI for rough mixed surfaces.
Same-depth series: the 45mm asymmetric gravel rim ($310) runs a narrower 24-25mm bed; the 45mm 36/30mm rim ($320) is wider still.
Adjacent depth: the 50mm 34/28mm rim ($310) adds flat aero; this 45mm rim stays lighter and calmer.
Disc builds only; respect the system weight limit.
Target Audience & Usage Notes.
all-road, gravel and endurance riders and wheel builders.
Disc-brake frames; 20/20 drilling, customisable valve/spoke holes.
Max PSI and rider limit per spec table rating.
The Ride That Awaits.
Built tubeless with a 40mm tyre it feels remarkably versatile - a quick aero pulse on the tarmac, a settled comfort on the gravel, all in one wheel.
It asks you where you want to go.
Free shipping and a 3-year rim warranty support the build.
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- Material: Toray carbon fiber
- Rim depth: 45mm
- External width: 34mm
- Internal width: 28mm
- Size: 700c
- Profile: hooked U-profile, tubeless-ready
- Weight Tier: 370-445g
- Max Tire Pressure: 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 weight range (depending on build grade) is not the lightest for steep climbs. Riders prioritizing weight 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 depth 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 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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- 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 brake only
- Tire Type: Tubeless ready clincher
- Tire Width Range: 33-48mm
- Brake Standard: Disc brake
- Drivetrain: Compatible with standard road drivetrains
- Rotor Standard: Disc brake compatible
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| Translation missing: en.product.metafields.model | Translation missing: en.product.metafields.hub | Translation missing: en.product.metafields.spoke | Translation missing: en.product.metafields.bearing | Translation missing: en.product.metafields.weight | Translation missing: en.product.metafields.depth | Translation missing: en.product.metafields.width | Translation missing: en.product.metafields.price |
|---|---|---|---|---|---|---|---|
| Bola 45 | _ | _ | _ | 370-445g | 45mm | 28mm | see store |
| 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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