• Bola 700c 45mm Carbon Road Rim – 34mm Outer, 28mm Inner, Tubeless Ready
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700C 50mm Asymmetric Carbon Rim 30mm | Bola

700C 50mm Asymmetric Carbon Rim 30mm | Bola

$320.00 USD
$360.00 USD $320.00 USD
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Free shipping  |  VAT included in EU & USA
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A 50mm asymmetric Toray UD carbon rim with 36/30mm widths, tubeless-ready, and four weight tiers for road and light-gravel performance.

Aero Meets Wide-Tire Comfort

The BOLA 50mm asymmetric rim balances aero speed with modern wide-tire support. Its 36mm outer and 30mm inner width is tuned for 28–35mm tubeless road tires, while the offset bed evens spoke tension for durable builds.

Buying Guide.

Weight tier - Extreme Light ~400g: elite climbers on smooth roads, the thinnest layup.

Weight tier - Ultralight ~415g: for weight-race builds and attacks over hilly courses.

Weight tier - Superlight ~455g: the all-round middle, lively yet durable.

Weight tier - Standard ~495g: higher load capacity for larger riders and training miles.

Internal width - 30mm: tuned for wide road tires; it rewards 28-35mm rubber and lower pressure over skinny, high-pressure tires.

Adjacent depth - the asymmetric offset evens spoke tension; for pure climbing step to a shallower Bola rim.

Target Audience & Usage Notes.

Road racers, triathletes on rolling courses, gran fondo riders and mixed-surface builders.

Not for extreme mountain descents or heavy gravel use.

The Ride That Awaits.

Stand on the pedals and the deep wide hoop surges forward, carrying 28-35mm tubeless rubber that floats over rough tarmac while the offset keeps everything honest and true. It is the wheel that makes a flat road feel shorter and a long day feel easy. A 3-year warranty and free shipping let you build the wheelset you have been planning.

Specifications
Size: 700c
Material: Genius Toray carbon fiber
Rim Depth: 50mm
Bead Type: Hooked
Inner Width: 30mm
Outer Width: 36mm
ERD (Effective Rim Diameter): TBD
Weight Tier: Standard (495g), SL (455g), UL (415g), EL (400g)
Trade-offs & Considerations
Aero vs Crosswind: The 50mm depth saves about 4.5W versus a 35mm rim at 40km/h; at 10° yaw the asymmetric 36mm outer width keeps the spoke line balanced and steering predictable, at the cost of a higher crosswind signature than a 40mm rim.
Weight vs Stiffness: The Extreme Light tier (400g) saves about 95g versus the Standard tier (495g) at the same 50mm depth (±5g); lateral stiffness holds within 3% across tiers, and the asymmetric drilling evens rear spoke tension.
Tire-Type Trade-off: The hooked bead accepts clincher and tubeless tyres from about 28c to 35c on the 30mm inner width; 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 $320; custom spoke-hole count 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: >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: 120kgs
Recommended Use Cases
Sprinting / Criterium: Excellent. The stiff carbon rim and 50mm depth provide quick acceleration and hold speed well in sprint finishes.
Triathlon / TT: Excellent. Aerodynamic profile is ideal for time trials and triathlons where speed on flats is key.
Road Racing: Good. Balanced aero and weight make it suitable for most road races, especially with rolling terrain.
Gran Fondo / Endurance: Good. Tubeless setup and wider tires improve comfort for long rides, though weight may be a factor on hilly fondos.
Climbing / Hill Repeats: Suitable. Lighter SL/UL/EL options are better for climbing, but the 50mm depth is not optimal for steep climbs.
Not Recommended For: Not recommended for extreme mountain descents or heavy gravel use; it's designed for road and light gravel.
Compatibility
Frame Compatibility: 700C/ISO 622 road and gravel bikes
Tire Type: Tubeless ready, compatible with clincher and tubeless tires
Tire Width Range: 35–48mm
Brake Standard: Disc brake compatible
Drivetrain: Shimano/SRAM compatible
Rotor Standard: N/A (hub dependent)
How It Compares
ModelWeightDepthWidthPrice
700C 50mm Rim 36mm Standard (495g), SL (455g), UL (415g), EL (400g) 50mm 36mm See store
Model A ~430g 50mm 28mm $1,399
Model B ~430g 50mm 27mm $249
Model C ~420g 50mm 30mm $389
FAQ
Which tyres fit on the 30mm inner rim, and what pressure suits me?
The 30mm inner width supports 28mm–35mm tubeless tyres, with a sweet spot of 30–33mm at roughly 50–70 PSI; it is a hooked bed, so standard clinchers mount directly.
How do I work out the right spoke length for this rim?
Contact Bola for the exact ERD before ordering spokes. Once we confirm the figure, plug it into a known calculator (Sapim / DT) and add the recommended correction.
What is the maximum spoke tension I can run on 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.
Do these rims accept standard clincher tyres, and is there a pressure cap?
Hooked rims fit standard clincher tyres directly, no hookless pressure cap applies.
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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