700c 34mm Wide Carbon Gravel Bike Rim | 35mm & 40mm Depth | 24H Disc Brake | 370–440g | Bola

700c 34mm Carbon Gravel Rim — 24-Hole Disc Brake, 370–440g

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

Weight Variants

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.