# 700c 34mm Wide Carbon Gravel Bike Rim | 35mm & 40mm Depth | 24H Disc Brake | 370–440g | Bola ## Premium 700c Carbon Gravel Bike Rim for Ultimate Performance The Bola 700c carbon gravel rim is a tubeless-ready, disc-brake-specific rim built for gravel racing, mixed-terrain endurance, and custom wheelset builds. Available in 35mm and 40mm profile depths with a 34mm external / 25mm internal width, it accommodates tire widths from 28mm to 50mm and accepts pressures between 100 and 125 psi. Weight ranges from 440g (standard) to 370g (extreme light) depending on selected layup — enabling builders to balance durability against weight targets without changing rim geometry. ## Key Specifications Parameter Specification Rim Diameter 700c (ISO 622mm BSD) Profile Depth 35mm or 40mm (UV wave shape) External Width 34mm (35mm profile) / 31mm (40mm profile) Internal Width 25mm ERD 559mm Spoke Count 24 holes Brake Type Disc brake only Valve Hole 6.5mm (customizable) Spoke Hole 4.5mm (customizable) Assembly Hole 7.5mm (customizable) Nipple Angle (Front) 7° Nipple Angle (Rear) 5° & 7° (customizable) Tire Pressure Range 100–125 psi Max Rider Weight 120 kg Flatness Tolerance <0.15mm Roundness Tolerance <0.3mm Dynamic Balance <3g ## Weight Variants Grade Weight per Rim Best For Standard 440 ± 15g Training builds, heavier riders (up to 120kg) Superlight 415 ± 10g Endurance gravel racing, mixed terrain Ultralight 390 ± 10g Competitive gravel racing, weight-optimized builds Extreme Light 370 ± 10g Elite racing; best paired with riders under 75kg ### Trade-off Note The Extreme Light (370g) layup prioritizes weight reduction over impact margin. For riders over 90kg or on highly technical, rock-strewn terrain, the Superlight (415g) or Standard (440g) grade is recommended to maintain spoke tension integrity over >280kg and forward compressive strength >300kg. ## Structural Performance Data - **Forward Compressive Strength:** >300kg - **Lateral Torsion Resistance:** >50kg - **Spoke Hole Tension Tolerance:** >280kg - **Dynamic Equilibrium:** <3g imbalance - **Flatness:** <0.15mm - **Roundness:** <0.3mm ## Use-Case Fit - **Gravel Racing (mixed surface):** 34mm internal width supports 40–50mm tires at lower pressures for traction; 40mm depth adds aero efficiency on open road sections. - **Endurance / Bikepacking:** 35mm depth lowers crosswind sensitivity while retaining structural stiffness for loaded builds. - **Custom Wheelset Builds (OEM/Brand):** Customizable spoke hole diameter (4.5mm std), nipple angles, valve hole size, and branding options make this rim suitable for small and medium cycling brands sourcing OEM-ready components. - **Tubeless Setup:** 25mm inner width and tubeless-compatible bead profile support tubeless conversion with standard tape and valves. ## Customization Options - Spoke hole diameter: 4.5mm standard or custom - Valve hole diameter: 6.5mm standard or custom - Assembly hole diameter: 7.5mm standard or custom - Nipple angle: customizable per front/rear application - Logo, color finish, and decal options available for brand partners ## Frequently Asked Questions **Is a 34mm wide carbon rim too wide for gravel riding?** No. A 34mm external / 25mm internal width is within the optimal range for gravel-specific tire fitment (38–50mm tires). It provides a supportive bead base that improves tire casing shape, lowers rolling resistance, and allows lower inflation pressures for better traction on loose surfaces. **What is the difference between the 35mm and 40mm depth options?** The 35mm profile is shallower, reducing crosswind sensitivity and weight — better suited for technical or mountainous gravel routes. The 40mm profile provides modest aerodynamic gain on flat or open sections. Both share the same 34mm/25mm width and structural tolerances. **How light can a carbon gravel rim be without sacrificing durability?** At 390g (Ultralight) and 370g (Extreme Light), both grades maintain spoke hole tension tolerance >280kg and forward compressive strength >300kg. The Extreme Light grade is best suited for riders under 75–80kg on non-technical terrain. The Ultralight (390g) is the recommended balance point for most competitive applications. **Is this rim compatible with tubeless tires?** Yes. The rim features a tubeless-compatible bead profile with a 25mm internal width. Standard tubeless rim tape and valves (6.5mm valve hole) are required; these are not included. **What spoke count and hole pattern does this rim use?** This rim uses a 24-hole pattern, suitable for building lightweight disc brake gravel wheelsets with standard J-bend or straight-pull spokes. Custom hole counts may be available — contact us for OEM enquiries. **What is the warranty and quality assurance policy?** All rims are backed by a three-year warranty. Each unit is manufactured to flatness <0.15mm and roundness <0.3mm tolerances, with dynamic balance verified at <3g per rim. ### Design and Dimensions The 700c carbon gravel bike rim by Bola boasts a 34mm internal width, optimized for gravel riding stability and comfort. Available in two rim depths, 35mm and 40mm, this rim strikes an ideal balance between aerodynamics and control on mixed terrain. Its 24-hole configuration enhances durability and wheel strength, making it perfect for demanding gravel trails. These design choices ensure excellent tire support and improved ride quality for gravel cyclists seeking both speed and resilience. ### Lightweight and Durable Construction Weighing between 370 and 440 grams depending on depth, this 700c carbon gravel bike rim offers a superior weight-to-strength ratio. Crafted from high-quality carbon fiber, it provides exceptional stiffness and impact resistance while keeping the wheelset light for efficient power transfer. This lightweight construction reduces fatigue on long rides and improves acceleration, making it an excellent choice for competitive and recreational gravel riders alike. ### Compatibility and Performance Features Specifically designed for 24-hole disc brake setups, the Bola carbon rim ensures compatibility with modern gravel bike braking systems. Its carbon layup and rim profile optimize heat dissipation during braking, reducing fade and enhancing control on steep descents. Combined with the rim's robust build and wide 34mm internal width, this rim delivers responsive handling and reliable stopping power in diverse off-road conditions. ## Details - **Price:** 310.0 USD - 340.0 USD - **Type:** Carbon Bicycle Rim - **Tags:** 34mm wide, 700c, 700c carbon gravel bike rim, Bola bike rims, carbon gravel rim, disc brake gravel rim, lightweight bike rim, rims ## Variants | Variant | Price | Available | |---------|-------|-----------| | UD Matt / Standard | 310.00 USD | In stock | | UD Matt / Superlight | 320.00 USD | In stock | | UD Matt / Ultralight | 330.00 USD | In stock | | UD Matt / Extremelight | 340.00 USD | In stock | | UD Glossy / Standard | 310.00 USD | In stock | | UD Glossy / Superlight | 320.00 USD | In stock | | UD Glossy / Ultralight | 330.00 USD | In stock | | UD Glossy / Extremelight | 340.00 USD | In stock | | Marble Matt / Standard | 310.00 USD | In stock | | Marble Matt / Superlight | 320.00 USD | In stock | | Marble Matt / Ultralight | 330.00 USD | In stock | | Marble Matt / Extremelight | 340.00 USD | In stock | | Marble Glossy / Standard | 310.00 USD | In stock | | Marble Glossy / Superlight | 320.00 USD | In stock | | Marble Glossy / Ultralight | 330.00 USD | In stock | | Marble Glossy / Extremelight | 340.00 USD | In stock | ## Images - 700c 34mm wide carbon gravel bike rim set with UCI logo and Bola branding, designed for disc brakes, 24H, 370–440g. - Bola 700c carbon gravel rim – UV wave profile cross-section showing 34mm external width - 700c 34mm Wide Carbon Gravel Bike Rim diagram showing dimensions and specifications for 35mm & 40mm depth, 24H disc brake. - Bola 700c 45mm Carbon Road Rim – 34mm Outer, 28mm Inner, Tubeless Ready - Bola 700c 45mm Carbon Road Rim – 34mm Outer, 28mm Inner, Tubeless Ready - 700c 34mm Wide Carbon Gravel Bike Rim | 35mm & 40mm Depth | 24H Disc Brake | 370–440g | Bola Carbon Fiber Sporting Goods - 700c 34mm Wide Carbon Gravel Bike Rim | 35mm & 40mm Depth | 24H Disc Brake | 370–440g | Bola Carbon Fiber Sporting Goods ## Additional Information - **Related products settings:** ahead --- > Source: [Bola Carbon Wheelset ](https://bolacarbon.com/products/700c-34mm-wide-carbon-gravel-bike-rim-35mm-40mm-depth-24h-disc-brake-370-440g-bola) > Updated: 2026-07-31