• 700C 40mm carbon tubeless rim cross-section showing 30mm inner width and spoke hole detail
  • Bola 700c 45mm Carbon Road Rim – 34mm Outer, 28mm Inner, Tubeless Ready
  • 40mm Carbon Road Rim – 36mm Outer / 30mm Inner Width, Tubeless Ready, 700C, Ultralight (365–445g) Bola
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40mm Carbon Tubeless Road Rim — 700C, 30mm Internal | Bola

40mm Carbon Tubeless Road Rim — 700C, 30mm Internal | Bola

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

A 40mm hooked UV carbon road rim with 36/30mm widths, tubeless-ready, disc-brake, and four weight tiers 365–445g.

Quick-Acceleration Wide-Bed Rim

The BOLA 40mm tubeless rim accelerates quickly on climbs, soaks up rough pavement on long days, and adapts to custom wheel builds. Its 30mm internal width and 36mm external width create a stable tire platform for 35c–48c tires.

Buying Guide.

Weight tier - Extreme Light ~365g: smooth-road climbers.

Weight tier - Ultralight ~385g: race builds.

Weight tier - Superlight ~410g: gran fondo middle.

Weight tier - Standard ~445g: larger riders and durability.

Bead - hooked: broad tire compatibility for standard road tubeless; it is not hookless-only.

Internal width - 30mm: a wide bed for 35-48c tires; choose it for comfort, pick a narrower Bola bed for speed.

Target Audience & Usage Notes.

Road racers, gran fondo riders, and custom wheelset builders.

Not for aggressive off-road or extreme gravel abuse.

The Ride That Awaits.

String it up and feel it accelerate like it is eager to go - the hooked bed swallowing 35-48c tires, the wide platform soaking up rough pavement so the long gran fondo disappears beneath you. It is quick, comfortable, unstoppable. Rated to a real rider weight and backed by a 3-year warranty with free shipping.

Specifications
Size: 700c
Material: Genius Toray carbon fiber
Rim Depth: 40mm
Bead Type: Hooked
Inner Width: 30mm
Outer Width: 36mm
ERD (Effective Rim Diameter): TBD
Weight Tier: Standard (445g), Superlight (410g), Ultralight (385g), Extreme Light (365g)
Trade-offs & Considerations
Aero vs Crosswind: The 40mm depth saves about 3.0W versus a 28mm rim at 40km/h; at 10° yaw the 36mm outer width keeps steering input predictable, with a smaller crosswind signature than a 50mm rim.
Weight vs Stiffness: The Extreme Light tier (365g) saves about 80g versus the Standard tier (445g) (±5g); lateral stiffness holds within 3% across tiers at the same 40mm depth.
Tire-Type Trade-off: The hooked bead accepts clincher and tubeless tires from about 25c to 50c; the sweet spot is 28 to 45c for road and light gravel. Tubeless cuts rolling resistance but needs tape, valve and sealant.
Sourcing & Delivery Trade-off: Stock drilling ships in 1–3 business days at $310; custom valve hole, spoke holes or nipple angles 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: 105kgs
Recommended Use Cases
Climbing / Hill Repeats: Good
Gran Fondo / Endurance: Excellent
Road Racing: Good
Sprinting / Criterium: Suitable
Training / Daily Riding: Excellent
Not Recommended For: Not recommended for aggressive off-road or extreme gravel abuse.
Compatibility
Frame Compatibility: Compatible with 700C road, endurance, and gravel frames with at least 40mm rim clearance. Verify frame clearance before ordering.
Tire Type: Tubeless-ready, hooked bead compatible with standard road tubeless tires (not hookless-only).
Tire Width Range: 35c-48c
Brake Standard: Disc brake
Drivetrain: N/A (hub-dependent)
Rotor Standard: N/A (hub-dependent)
How It Compares
ModelWeightDepthWidthPrice
700C 40mm Rim 36mm Standard (445g), Superlight (410g), Ultralight (385g), Extreme Light (365g) 40mm 36mm See store
Model A (adapted reference) ~430g 50mm 28mm $1,399
Model B (adapted reference) ~420g 50mm 30mm $389
Model C (adapted reference) ~430g 50mm 27mm $249
FAQ
Which tyres fit on the 30mm inner rim, and what pressure suits me?
The 30mm inner width accepts 25c–50c tubeless tyres, with a sweet spot of 28c–45c for endurance and light gravel; it is a hooked bed, so standard clincher and tubeless both 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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