Bola 700c Carbon Road Rim 55mm – 28mm Wide Tubeless, Asymmetric or Symmetric, 430–515g

Bola 700c Carbon Road Rim – 55mm Profile, 28mm Wide, Tubeless Ready

The Bola 55mm carbon rim is a 700c tubeless-ready road rim available in asymmetric or symmetric spoke-bed geometry, with an outer width of 28mm and inner width of 21mm (hooked) or 23mm (hookless). Weight options range from 430g to 515g per rim, making it suitable for race builds and endurance wheelsets alike.

Weight Variants

Tradeoff note: Each step toward Extremelight reduces rim weight by approximately 15–35g but narrows manufacturing tolerances. Riders prioritising training longevity should consider Normal or Superlight grades.

Full Technical Specifications

• Rim diameter: 700C (ISO 622)
• Rim profile: U-shape, 55mm height
• Outer width: 28mm
• Inner width: 21mm (hooked) / 23mm (hookless)
• ERD: 528mm
• Spoke hole diameter: 4.5mm (customisable)
• Valve hole diameter: 6.5mm (customisable)
• Assembly hole diameter: 7.5mm (customisable)
• Nipple direction: Front 7°; Rear 5° & 7° (customisable)
• Flatness: <0.15mm
• Roundness: <0.3mm
• Dynamic balance: <3g
• Forward compressive strength: >300kg
• Lateral torsion: >50kg
• Spoke hole tension: >280kg
• Tyre pressure range: 100–125psi
• Maximum rider weight: 120kg

Asymmetric vs. Symmetric: Which Should You Choose?

Asymmetric rims offset the spoke bed to equalise spoke tension between the drive and non-drive sides of a rear wheel, reducing spoke fatigue and improving wheel stiffness under pedalling loads. They are particularly beneficial on rear wheels with cassette-driven dishing. Symmetric rims are preferred for front wheels or custom builds requiring equal flange geometry. Both variants share identical aerodynamic profiles and weight grades.

Tubeless Compatibility

This rim is compatible with both hooked and hookless tubeless tyre setups. The 21mm inner width (hooked) supports tyres from 25c to 32c; the 23mm hookless variant is optimised for 28c–35c tubeless tyres at pressures up to 125psi. Ensure tyre manufacturer hookless compatibility before using hookless configuration.

Frequently Asked Questions

Are these rims compatible with Shimano, Campagnolo, and SRAM cassette bodies?

Rim compatibility depends on hub and spoke count selection, not the cassette standard. These rims are hub-agnostic and support standard J-bend and straight-pull spoke configurations based on customised drilling.

What is the difference between Ultralight and Extremelight grades?

Ultralight rims weigh 450 ± 10g and suit competitive road racing. Extremelight rims weigh 430 ± 10g and are intended for elite-level competition where every gram is critical. The Extremelight grade has tighter weight tolerances (±10g vs ±15g on Normal/Superlight) reflecting higher-precision layup.

Can I use these rims for gravel or cyclocross?

These rims are designed for 700c road cycling. The 55mm aerodynamic profile and 125psi maximum tyre pressure limit their suitability for off-road use where lower pressures and wider tyres are preferred.

What spoke count options are available?

Spoke hole count and drilling pattern are customisable. Contact Bola directly to specify spoke count for your build.

Do these rims require a tubeless rim tape?

Yes. Standard tubeless rim tape installation is required to seal spoke holes before mounting a tubeless tyre and sealant.