700C Carbon Gravel cyclocross Rim 30mm Tubeless | Bola
700C Carbon Gravel cyclocross Rim 30mm Tubeless | Bola
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The Bola 700C 30mm carbon gravel/cyclocross rim - a 30mm V-section, 30mm-wide tubeless rim with 24-25mm internal width in four light weight options, for gravel and CX.
Where the dirt track tightens and the course turns unpredictable, this rim keeps the rider light on their feet and quick to react.
Buying Guide.
Weight tier - ~325g (Ultralight): the feather for tight CX and steep gravel climbs.
Weight tier - ~345-365g (Ultralight): the balanced race pick for most gravel and CX riders.
Weight tier - ~390g (Light): the tough end for rocky CX and heavier riders.
Internal width - 24mm: 33-42c at ~35-55 PSI for cyclocross.
Internal width - 25mm: 40-50c at ~25-45 PSI for high-volume gravel.
Same-depth series: the 30mm 36/30 gravel rim ($320) runs a wider bed; this rim stays narrow, light and nimble.
Adjacent depth: the 45mm gravel asym rim ($310) adds aero on fast gravel; this 30mm rim is the calmer, lighter choice.
Target Audience & Usage Notes.
gravel racers, CX riders, bikepackers and wheel builders.
Disc-brake gravel/CX frames; single rim.
Rated to 100kg system weight.
Not a deep aero or road-race rim.
The Ride That Awaits.
On a wet CX course, let the tyre press into mud and grass at low pressure; the rim follows where you point it, nimble as a fox through the tape.
Every snap of the pedals comes back alive, with no dead spot.
Free shipping and a 3-year rim warranty support your off-road campaign.
Specifications
- Material: carbon fiber
- Rim depth: 30mm
- External width: 30mm
- Internal width: 24mm / 25mm
- Size: 700C
- Profile: V-section
- Weight Tier: 325g / 345g / 365g / 390g
- Max Tire Pressure: 90
Trade-offs & Considerations
- Aero vs Climbing: At 30mm depth, this rim offers a balance between aerodynamic efficiency and climbing performance. It reduces drag compared to shallow rims while keeping weight low, with options from 325g to 390g, making it responsive on climbs without significant aero penalty.
- Weight vs Durability: Weight ranges from 325g to 390g depending on variant, allowing riders to choose between lighter weight for climbing or heavier build for increased durability. The unidirectional plus woven carbon laminate provides strength, while heavier variants likely use more material for impact resistance.
- Tire Volume vs Speed: Wide rim design (30mm external, 24-25mm internal) supports tires from 33c to 50c, enabling high-volume setups for comfort and traction on rough terrain. However, larger tires increase rolling resistance and weight, potentially reducing speed on smooth surfaces.
- Crosswind vs Aero: The 30mm rim depth is moderate, providing good crosswind stability while still offering some aerodynamic benefit. It avoids the crosswind sensitivity of deeper rims (50mm+), making it predictable in gusty conditions.
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: 100
Recommended Use Cases
- Gravel Racing: Excellent
- Bikepacking: Good
- Gran Fondo / Endurance: Good
- Road Racing: Not recommended
- Training / Daily Riding: Good
- Not Recommended For: Not recommended
Compatibility
- Frame Compatibility: 700C disc brake frames (gravel/CX bikes)
- Tire Type: Tubeless-ready clincher
- Tire Width Range: 27-42c
- Brake Standard: Disc
- Drivetrain: N/A (rim only)
- Rotor Standard: Center-lock and 6-bolt
How It Compares
| Model | Hub | Spoke | Bearing | Weight | Depth | Width | Price |
|---|---|---|---|---|---|---|---|
| 700C Carbon Gravel/Cyclocross Rim | - | - | - | 325-390g | 30mm | 24mm / 25mm | see store |
| 30 Carbon Gravel | - | - | - | ~350g | 30mm | 30mm | ~$400 |
| 30 Gravel | - | - | - | ~360g | 30mm | 30mm | ~$450 |
| Gravel 30 | - | - | - | ~340g | 30mm | 30mm | ~$380 |
FAQ
How do I set up this rim tubeless?
Setting up tubeless is straightforward. The rim is designed with a 6.5mm valve, and you'll need tubeless tape compatible with 24-25mm internal width. Use a sealant like Stan's or Orange Seal. Mount a tubeless tire, inflate to 30-50 psi depending on tire size, and ensure a proper bead seat. The rim's wide profile helps prevent burping in rough terrain.
What tire sizes are compatible?
The rim has an external width of 30mm and internal widths of 24mm (for 33-42c tires) and 25mm (for 40-50c tires). So it supports a wide range of gravel and cyclocross tires. For gravel, 40-50c is recommended; for cyclocross, 33-42c. This allows you to run lower pressures for comfort and grip.
How much weight does this rim save compared to aluminum?
Carbon rims typically save 200-400g per rim compared to aluminum. This rim weighs between 325g and 390g depending on the variant. For example, a typical aluminum rim at similar width might weigh 450-500g, so you could save 50-150g per rim. Over a wheelset, that's a significant reduction in rotating weight.
Can I build this rim into a custom wheelset?
Yes, this rim is designed for custom builds. It supports both center-lock and 6-bolt disc brake rotors, and has a spoke bed compatible with standard J-bend spokes. You can choose your own hubs and spokes. Ensure the rim is tensioned within the recommended range (max spoke tension >300kg) to avoid damage.
How should I inspect and maintain this carbon rim?
Regularly check for cracks, chips, or delamination on the rim surface. After rides, clean with mild soap and water. Avoid excessive heat from braking; the rim is designed for disc brakes, so heat is dissipated through the rotor, not the rim. Impact damage from rocks can cause hidden structural issues, so inspect after heavy impacts. Replace if you see any structural damage.
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
