• Bola 700c 45mm Carbon Road Rim – 34mm Outer, 28mm Inner, Tubeless Ready
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700C Tubeless 45mm Carbon Road Rim 34/28mm Wide | Bola

700C Tubeless 45mm Carbon Road Rim 34/28mm Wide | Bola

$310.00 USD
$350.00 USD $310.00 USD
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Free shipping  |  VAT included in EU & USA
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Spoke QTY
Weight

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.

Specifications
Size: 700c
Material: Genius Toray carbon fiber
Rim Depth: 45mm
Bead Type: Hooked
Inner Width: 28mm
Outer Width: 34mm
ERD (Effective Rim Diameter): 548mm
Weight Tier: 370-445g
Trade-offs & Considerations
Aero vs Crosswind: The 45mm depth saves about 4.0W versus a 35mm rim at 40km/h; the 34mm outer width smooths airflow over a 28–32c tyre, but the broad bed raises the crosswind signature slightly versus a 28mm-wide rim.
Weight vs Stiffness: The lightest layup (370g) saves about 75g versus the heaviest (445g) at the same 45mm depth (±5g); the wide 28mm internal bed adds lateral stiffness for stable cornering.
Tire-Type Trade-off: The hooked U-profile bed is tubeless-ready and supports 25–32c tyres; the 28mm internal width lets you run lower pressures for comfort and grip, trading a narrower pressure range for bigger tyre volume.
Sourcing & Delivery Trade-off: Stock drilling ships in 1–3 business days at $310; custom spoke/valve hole specs or decals add 7–15 business days and roughly a $40–80 premium.
Performance Test Data
Fatigue Test: 750,000 cycles @640N (ISO 4210-7 Annex A, informative only)
Impact Resistance: >60J (Higher than ISO 4210-7)
Flatness: <0.25mm (internal QC)
Roundness: <0.3mm (internal QC)
Max Spoke Tension: >350 kgf (internal QC, spoke breaking tension)
Ultimate Strength: >200 kgf (internal QC, static spoke-hole point load)
Dynamic Equilibrium: <3g (internal QC)
Radial Stiffness: 90–110 N/mm (internal lab)
Lateral Stiffness: ≥8N/mm
Max System Weight: 110kgs
Recommended Use Cases
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
Compatibility
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
How It Compares
ModelWeightDepthWidthPrice
700C 45mm Rim 34mm 370-445g 45mm 34mm See store
Model A ~430g 50mm 28mm $1,399
Model B ~430g 50mm 27mm $249
Model C ~420g 50mm 30mm $389
FAQ
Which tyres suit the 28mm internal width?
The 28mm internal width is tuned for 32–40c road and gravel tyres, giving a wider, suppler contact patch than a narrow race rim.
What spoke drillings are available, and which brake type is this rim rated for?
Spoke drillings and brake rating depend on the build option, selectable at checkout. If you plan to lace your own wheel, confirm the drilling and brake type with Bola before ordering so the rim matches your hub and frame.
What is the maximum spoke tension for this rim?
Drive-side / disc-side max tension is 130–140 kgf, with the non-drive side adapted to match; spoke holes are locally reinforced inside the carbon layup to prevent pull-out cracking.
Will the rim crack on rock gardens or bottom-outs at low pressure?
The rim bead area uses a thickened impact-reinforced layer; impact testing passes >60J extreme impacts (above the ISO 30J standard). An inner width of 28mm accepts wider tyres, which deform to absorb shock at low pressure.
Will I really pay no customs or VAT for delivery to the US and EU?
Yes. The Economy channel ships DDP — duties and VAT are fully prepaid by us, cleared in advance, delivered to your door with no extra payment to customs or the courier.
Warranty & Shipping
Warranty Period: 3 years
Crash Replacement: 30% discount on replacement parts
Processing Time: In stock: 1–3 business days · Out of stock or custom order: 7–15 business days
Shipping method: FedEx/UPS/DPD/EMS Economy (free with duties & VAT included in USA & EU) · Expedited option available
Estimated Delivery: Economy 7–20 business days · Expedited 3–7 business days, customs clearance excluded
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