Bola 700c Carbon Tubeless Road Rim – 50mm Deep, 28mm Wide, Hooked or Hookless, 370–470g

Bola 700c Carbon Tubeless Road Rim — 50mm Deep, 28mm Wide

The Bola 50mm carbon tubeless road rim delivers a measurable aerodynamic and compliance advantage for road racing, gran fondo, and endurance riding. Available in hooked (21mm inner width) and hookless (23mm inner width) configurations, it supports tire widths from 25c to 32c and a maximum tire pressure of 125 psi (hooked) in line with ETRTO 2023 tubeless standards.

Key Specifications

Weight Options

Note: Lighter grades use a reduced layup schedule. While the Extreme Light option (370 ± 10 g) offers the lowest rotating mass, the Standard grade (470 ± 15 g) provides greater impact resistance for rougher road surfaces or heavier riders approaching the 120 kg limit.

Structural Performance Data

• Forward Compressive Strength: >300 kg
• Lateral Torsion Resistance: >50 kg
• Spoke Hole Tension Rating: >280 kg
• Dynamic Equilibrium (balance): <3 g
• Flatness Tolerance: <0.15 mm
• Roundness Tolerance: <0.3 mm

Hooked vs. Hookless: Which Should You Choose?

• Hooked (21mm inner width): Compatible with all clincher and tubeless road tires. Recommended for riders using tires rated below ETRTO hookless certification, or for mixed-surface use where higher pressures may be needed.
• Hookless (23mm inner width): Provides a larger air volume, improved ride compliance, and aerodynamic tire-rim integration at lower pressures (recommended 72–87 psi with compatible tires). Requires ETRTO-approved hookless-compatible tires only.

Compatibility & Build Notes

• Tubeless-ready straight from the factory — no conversion tape required on the rim bed
• Compatible with standard road hubs (100mm front / 130mm or 142mm rear)
• Supports both center-lock and 6-bolt disc configurations when spec'd at build
• Custom spoke, valve, and assembly hole diameters available on request

Frequently Asked Questions

Is a 28mm wide rim better than 25mm for aerodynamics?

Yes, for tires 28c and wider. The 28mm outer width creates a continuous aero profile with 28–32c tires, reducing the 'light bulb' effect. For 25c tires, the aerodynamic benefit is marginal but the larger air volume still reduces rolling resistance.

How light should a carbon road rim be for climbing?

For dedicated climbing builds, rims under 400 g per rim are considered competitive. The Ultra Light (390 g) and Extreme Light (370 g) grades fall within this range. Riders prioritizing durability over pure weight should select the Standard (470 g) or Super Light (430 g) grade.

Are hookless rims safe for road cycling?

Yes, when used with ETRTO-certified hookless-compatible tires at the manufacturer's recommended pressure (typically 72–87 psi for road). The hookless bead design is used by major OEM wheel manufacturers and is validated under ETRTO 2023 tubeless road standards.

What tire sizes are compatible with this rim?

The 21mm hooked inner width is optimized for 25c–32c tires. The 23mm hookless inner width is best matched to 28c–35c tires for an aerodynamically flush profile.

Does this rim come with a warranty?

Yes. A three-year manufacturer's warranty covers structural defects under normal riding conditions. Warranty excludes crash damage and use outside the stated rider weight or pressure limits.