• Bola 700c 45mm Carbon Road Rim – 34mm Outer, 28mm Inner, Tubeless Ready
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700C 50mm Carbon Road Rim 34mm 28mm Inner Tubeless Disc | Bola

700C 50mm Carbon Road Rim 34mm 28mm Inner Tubeless Disc | Bola

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

The Bola 700C 50mm carbon road rim - a 50mm U-shaped hooked disc rim, 34mm outer / 28mm internal, 370-445g, for wide-tire aero road and all-road builds.

A 50mm aero section wearing a wide, modern bed - built for the rider who refuses to choose between speed and 32mm tyre comfort.

Buying Guide.

Weight tier - light ~370g (Ultralight): for aero-all-road riders who climb and accelerate, wanting wide-tyre comfort.

Weight tier - upper ~445g (Light/Midweight): for rougher roads and heavier riders, adding impact margin.

Internal width - 28mm: 30-40mm at ~50-75 PSI for aero-all-road, 40-45mm at ~40-60 PSI for rough mixed surfaces.

Same-depth series: the 50mm 23mm UV rim ($310) is the narrow-bed speed option; the 50mm asym 36mm rim ($320) runs even wider.

Adjacent depth: the 45mm 34/28mm rim ($310) is lighter and crosswind-calmer.

Disc builds only; respect the system weight limit.

Target Audience & Usage Notes.

aero-all-road racers, gran fondo riders and wheel builders.

Disc-brake frames only; 20/20 drilling, customisable drilling. 120kg rider limit.

Use 30mm rim tape for tubeless.

The Ride That Awaits.

Built with a 32mm tubeless tyre it feels fast on the flat yet ably relaxed over rough all-road surfaces - wide enough to comfort you, deep enough to carry you.

You arrive faster and less spent.

Free shipping and a 3-year rim warranty support the build.

Specifications
Size: 700c
Material: Genius Toray carbon fiber
Rim Depth: 50mm
Bead Type: Hooked
Inner Width: 28mm
Outer Width: 34mm
ERD (Effective Rim Diameter): 538
Weight Tier: 370-445g
Trade-offs & Considerations
Aero vs Crosswind: 50mm depth saves about 4.5W versus a 35mm rim at 40km/h; at 10° yaw the 34mm outer width keeps the front end predictable on exposed roads, at the cost of a higher crosswind signature than a 40mm rim.
Weight vs Stiffness: The lightest layup (about 370g) saves about 75g versus the heaviest (about 445g) at the same 50mm depth (±5g); lateral stiffness holds within 4% across tiers.
Tire-Type Trade-off: The hooked bead mounts clincher or tubeless tyres from about 25c to 32c and is rated to 125psi; tubeless cuts rolling resistance but needs tape, valve and sealant to seal the bed.
Sourcing & Delivery Trade-off: Stock drilling ships in 1–3 business days at $310; a custom spoke-hole count, valve bore or nipple angle adds 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: >300 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: 120kgs
Recommended Use Cases
Sprinting / Criterium: Good. Stiffness and aero help in sprints, but weight may be a factor for punchy climbs.
Triathlon / TT: Excellent. 50mm depth provides significant aero advantage at sustained speeds.
Road Racing: Good. Balanced aero and stiffness, suitable for race days.
Gran Fondo / Endurance: Good. Wide tire compatibility and tubeless ready enhance comfort on long rides.
Climbing / Hill Repeats: Not recommended. Weight (370-445g) is heavier than dedicated climbing rims; shallower profiles are lighter.
Not Recommended For: Not recommended for extreme off-road or heavy gravel; designed for road and light gravel.
Compatibility
Frame Compatibility: 700c disc brake road and light gravel frames
Tire Type: Tubeless or clincher
Tire Width Range: 33-48mm
Brake Standard: Disc brake
Drivetrain: N/A
Rotor Standard: N/A(rim only)
How It Compares
ModelWeightDepthWidthPrice
700C 50mm Rim 34mm 370-445g 50mm 34mm See store
Model A ~430g 50mm 28mm $1,399
Model B ~430g 50mm 27mm $249
Model C ~420g 50mm 30mm $389
FAQ
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.
How does a deep-section rim handle crosswinds — will steering get pulled around?
An optimised profile keeps steering torque predictable at 10°–15° yaw, so high-speed descents stay planted even on deep-section builds.
What tyres can I mount on this rim, and what pressure should I run?
The 28mm inner width supports tyres from 25mm to 32mm, optimised around 28mm; both clincher and tubeless tyres mount on the hooked bead.
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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