Ultralight Carbon Gravel Bike Rims 700c | 34mm Wide, 25mm Inner U-Shape | 35mm & 40mm Heights | Disc Brake | Bola

Take a wheelset that balances race-day lightness with durable, tubeless-ready stability and you get Bola's 700c carbon gravel rims. Built for mixed-surface riding, endurance days and competitive gravel events, these rims pair a 34mm outer width and 25mm inner U-shape with distinct weight classes so you can prioritise durability, speed, or minimum rotational mass.

Ultralight Carbon Gravel Bike Rims 700c - Designed for gravel racing, endurance and mixed-surface riding

The U-shape 34mm outer / 25mm inner profile is engineered to stabilise wide tubeless tyres from roughly 28c to 50c, improving tyre volume and bead retention on rough terrain. Available in 35mm and 40mm rim heights to better match handling needs—35mm for technical, responsive control and 40mm for improved aerodynamic efficiency on faster mixed-surface efforts.

Riders experience reduced rolling resistance and predictable cornering when tyre volume is supported by a consistent internal channel width, and the three weight classes let teams and individuals choose the right trade-off between structural reserve and weight savings.

Why it fits your routine

• Tubeless-ready U-shape: 25mm internal width supports wider gravel tyre volumes and reliable tubeless seating for 28c–50c tyre ranges.
• Clear weight options: Choose Normal (460±15g), Superlight (410±10g), or Ultralight (360±10g) per rim to match training, racing, or weight-optimised builds.
• Two rim heights: 35mm for technical endurance and rough terrain; 40mm for mixed-surface racing where aerodynamic gains matter.
• Disc-brake specific: Engineered for disc braking systems to ensure consistent braking performance and compatibility with modern gravel bikes.
• Durability metrics: Forward compressive strength >300kg, lateral torsion >50kg, and spoke hole tension >280kg for dependable structural performance.
• Precision tolerances: Dynamic equilibrium <3g imbalance, flatness <0.15mm, roundness <0.3mm to simplify wheel building and maintain ride quality.
• Customization & OEM support: Assembly, valve and spoke hole diameters, nipple angles and branding options available for small and medium brands; three-year warranty on production runs.
• Riding weight limit: Rated for riders up to 120kg when used within specified tyre and terrain recommendations.

Technical details include a 34mm outer width (31mm variant available), ERD 539mm, max tyre pressure up to 125 psi, standard valve hole 6.5mm (customisable) and spoke hole 4.5mm (customisable). The U-profile preserves a consistent bead-seat channel across the rim, reducing tyre deformation under cornering loads compared with similarly sized V-shape rims and improving tubeless reliability on rough surfaces.

Weight-class guidance: Normal for training and heavier riders, Superlight for race-day gravel or cyclocross, and Ultralight for competitive, weight-optimised builds where the rider and terrain allow reduced mass while keeping structural tolerances within rated limits.