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700c 40mm Carbon Gravel Rim — Hooked 24mm / Hookless 25mm

700c 40mm Carbon Gravel Rim — Hooked 24mm / Hookless 25mm

Regular price $310.00 USD
Regular price $350.00 USD Sale price $310.00 USD
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Free shipping  |  VAT included in EU & USA
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The Bola 700c carbon gravel rim — a 40mm-deep, 30mm-wide hoop (325-395g) with hooked 24mm or hookless 25mm inner, tubeless-ready.

A deeper gravel arrow: a 40mm V-section adds aero composure on fast gravel sectors while the 30mm outer platform stabilizes wide tires. Choose hooked for broad compatibility or hookless for modern tubeless.

Buying Guide.

Weight tier - Extreme Light ~325g: the Ultralight race build for fast gravel and cyclocross days.

Weight tier - Ultralight ~345g: the race-and-training middle.

Weight tier - Superlight ~365g: the all-round gravel build.

Weight tier - Normal ~395g: the Light-grade durability build for rougher miles.

Internal width - Hooked 24mm: broad tube/tire compatibility - choose it if you sometimes run inner tubes or older tires.

Internal width - Hookless 25mm: modern ETRTO tubeless at lower pressure - choose it for the cleanest seal and lowest rolling pressure.

Same-family: this is the deeper rim in the gravel line, above the 30mm and 35mm options ($310) when aero on fast sectors matters.

Rider limit 100kg.

Target Audience & Usage Notes.

Gravel racing, bikepacking and mixed-terrain; not high-pressure road clinchers.

Rider limit 100kg; disc only.

The Ride That Awaits.

Point it down a fast gravel sector and feel the deeper V-section hold its line - aero enough to cut the wind, wide enough to steady a fat tire on rough ground. Bed it tubeless and it floats over ruts, settled where shallow wheels get blown about. Choose hooked or hookless and your layup; the 3-year rim warranty rides along.

Specifications
Size: 700c
Material: Genius Toray carbon fiber
Rim Depth: 40mm
Bead Type: Hooked / Hookless
Inner Width: 24/25mm
Outer Width: 30mm
ERD (Effective Rim Diameter): 558
Weight Tier: Normal (395g), Superlight (365g), Ultralight (345g), Extreme Light (325g)
Trade-offs & Considerations
Aero vs Crosswind: At 40mm depth this rim saves about 2.5W versus a 30mm rim at 40km/h; the wide 30mm outer profile lowers effective yaw and keeps steering calm at 10° crosswind on open gravel, at the cost of a modestly heavier, deeper section than a 30mm climbing rim.
Weight vs Stiffness: Moving from Normal (395g) to Extreme Light (325g) saves 70g per rim (±5g); lateral stiffness holds within 3% across tiers, so the lightest lay-up keeps the same gravel-rated structure.
Tire-Type Trade-off: The hooked version (24mm inner) accepts clincher and tubeless tyres up to 125 psi, while the hookless version (25mm inner) seals tubeless better but must use ETRTO-compliant tyres at lower pressure; tubeless cuts rolling resistance and pinch flats on rough ground.
Sourcing & Delivery Trade-off: Stock drilling ships in 1–3 business days at $310; custom ERD, valve hole, nipple angles 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: N/A
Recommended Use Cases
Gravel Racing: Excellent. Optimized for mixed terrain with 38c-50c tire support and aero profile.
Bikepacking: Good. Wide platform and weight options suit loaded touring, but lighter tiers may be less durable.
Gran Fondo / Endurance: Suitable. Comfortable with wide tires, but aero benefit limited on road surfaces.
Road Racing: Not recommended. Designed for gravel, not high-pressure road tires; max pressure capped.
Training / Daily Riding: Good. Durable options available, but better suited for gravel surfaces.
Not Recommended For: High-pressure road clincher applications; extreme-light tier for heavy riders.
Compatibility
Frame Compatibility: Disc brake frames and forks; compatible with thru-axle or quick release depending on hub (rim only)
Tire Type: Tubeless (hooked or hookless); also compatible with tubed setups using hooked version
Tire Width Range: 27c - 42c
Brake Standard: Disc only (no rim brake surface)
Drivetrain: Compatible with all drivetrains (rim is drivetrain-agnostic)
Rotor Standard: Compatible with any disc brake rotor (mounting depends on hub)
How It Compares
ModelWeightDepthWidthPrice
700C 40mm Rim 30mm Normal (395g), Superlight (365g), Ultralight (345g), Extreme Light (325g) 40mm 30mm See store
Model A ~430g 50mm 28mm $1,399
Model B ~420g 50mm 30mm $389
Model C ~430g 50mm 27mm $249
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.
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 >40J extreme impacts (above the ISO 30J standard). Inner widths of 24/25mm accept wider tyres, which deform to absorb shock at low pressure.
What tyres can I mount on this rim, and what pressure should I run?
The rim is built for gravel tyres from 38c to 50c; the hooked 24mm or hookless 25mm inner width both run lower pressures off-road.
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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