700c 40mm Carbon Gravel Rim — Hooked 24mm / Hookless 25mm
700c 40mm Carbon Gravel Rim — Hooked 24mm / Hookless 25mm
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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
- Material: carbon
- Rim depth: 40mm
- External width: 30mm
- Internal width: 24/25mm
- Size: 700c
- Profile: V-shaped
- Weight Tier: Normal (395g), Superlight (365g), Ultralight (345g), Extreme Light (325g)
- Max Tire Pressure: 110 (hooked) / 85 (hookless)
Trade-offs & Considerations
- Aero vs Climbing: 40mm depth offers moderate aero efficiency without significant weight penalty; select the 325g Extreme Light tier for climbing focus, or the 395g Normal tier for added durability.
- Stiffness vs Compliance: 30mm outer width provides a stiff platform for power transfer, but allows lower tire pressures for compliance; hooked (24mm inner) and hookless (25mm inner) options affect tire shape and ride feel.
- Tire Volume vs Speed: Supports 38c–50c tires for increased volume and traction on gravel; the 40mm profile reduces drag at higher speeds compared to shallower rims, balancing speed and grip.
- Weight vs Durability: Weight tiers span 325g to 395g; lighter tiers sacrifice durability margin, especially for heavier riders or harsh terrain, while heavier tiers offer more resilience and strength.
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
| Model | Hub | Spoke | Bearing | Weight | Depth | Width | Price |
|---|---|---|---|---|---|---|---|
| Bola 700c Carbon Gravel Rim | N/A | N/A | N/A | 325-395g | 40mm | 24/25mm | see store |
| 40 Carbon Gravel Rim | N/A | N/A | N/A | ~350g | 40mm | 30mm | ~$750 |
| 40|30 Gravel Rim | N/A | N/A | N/A | ~360g | 40mm | 30mm | ~$800 |
| 40 Gravel Rim | N/A | N/A | N/A | ~370g | 40mm | 30mm | ~$650 |
FAQ
How do I set up these rims tubeless?
Apply rim tape covering the spoke bed, install a compatible tubeless valve, and mount tubeless tires. Use a compressor or high-volume pump to seat the bead. The spoke bed is not sealed from the factory, so proper taping is essential. Hooked versions allow up to 125 psi; hookless versions follow ETRTO guidance (e.g., max 73 psi).
Which tire sizes are compatible?
The rims are designed for 38c to 50c gravel tires. The outer width is 30mm, with inner widths of 24mm (hooked) or 25mm (hookless). Mounted tire width is typically 2-3mm wider than labeled. Hookless requires ETRTO-compliant tires and lower pressure.
What weight savings can I expect between the tiers?
The Normal tier weighs 395±15g, Superlight 365±10g, Ultralight 345±10g, and Extreme Light 325±10g. Choosing Extreme Light saves 70g per rim compared to Normal, but reduces durability margin, especially for heavier riders or aggressive terrain.
Can I customize the rim for my build?
Yes, ERD, valve hole, spoke hole, assembly hole, nipple angles, and drilling patterns are customizable. You can specify these to match your hub and spoke choices. Contact us for custom orders.
What maintenance and inspection is recommended?
Regularly check spoke tension and true the wheel. Impact damage from rocks can cause flatness or roundness deviations; keep tolerances within 0.15mm flatness and 0.3mm roundness. The rims are disc-brake specific, so inspect for brake heat damage. Spoke hole tension should not exceed 280kg.
Warranty & Shipping
- Warranty Period: 3 years for rims / 2 years for wheelsets
- Warranty Coverage: Manufacturing defects on carbon structure
- Crash Replacement: 30% discount within warranty period
- Processing Time: 1–3 business days; 7–15 business days for custom or out-of-stock items
- Shipping Method: FedEx / UPS / DPD Economy (free, duties & VAT included) · Expedited option at checkout (duties & VAT payable on delivery)
- Estimated Delivery:Economy 7–20 business days · Expedited 3–7 business days, excluding customs clearance
- Packaging: Double-wall carton with foam protection
