Bola 700C 50mm Carbon Tubeless Road Rim – 32mm Inner / 38mm Outer Wide Asymmetric Offset Profile

Bola 700C 50mm Asymmetric Carbon Tubeless Road Rim

The Bola 700C is a 50mm profile, asymmetric tubeless-ready carbon rim engineered for road wheelbuilding. With a 32mm inner width and 38mm outer width, it accommodates 25–45mm road tires and improves spoke tension balance on drive-side vs. non-drive-side lacing. Available in four weight tiers to match race, endurance, or climbing builds.

Key Specifications

Weight Tiers

Structural Strength Data

• Forward Compressive Strength: >300 kg
• Lateral Torsion Resistance: >50 kg
• Spoke Hole Tension: >280 kg

Why Asymmetric Offset?

On rear wheels, drive-side spoke bracing angles are typically shallower than non-drive-side, resulting in uneven spoke tension. The Bola offset rim shell shifts the spoke bed laterally to equalize tension across both flanges — reducing spoke fatigue and improving wheel longevity under sustained load. Note: asymmetric rims require wheel builders to verify hub flange compatibility and dish offset before lacing.

Who This Rim Is For

• Road racers seeking a deep-section aero profile with tubeless capability and sub-415g rim weight (EL tier)
• Endurance riders running 32–40mm tires who need a wide inner channel without exceeding 120 kg rider weight limits
• Custom wheelbuilders who require precise ERD (548mm), nipple angle options, and hole diameter customization

Tradeoffs to Consider

• The 50mm profile increases aerodynamic drag in crosswinds above approximately 30 kph compared to 35–40mm rims — riders in mountainous or exposed terrain may prefer a shallower option.
• The 38mm outer width requires frame and fork clearance of at least 40mm; verify compatibility before ordering.
• EL (410g) tier uses a thinner layup; suitable for riders under 75 kg in non-cobbled race conditions.

Frequently Asked Questions

Is this rim compatible with tubeless tires?

Yes. The Bola 700C features a tubeless-ready bead seat and is compatible with standard tubeless road tires and sealant. A tubeless valve (not included) with a 6.5mm stem diameter is required.

What tire widths work with a 32mm inner wide rim?

ETRTO guidelines recommend 28–45mm tires for a 32mm internal width. A 32mm inner width widens the tire's contact patch and reduces sidewall stress compared to narrower 19–21mm rims.

What is the difference between SL, UL, and EL weight tiers?

The three tiers reflect different carbon layup schedules. SL (470g) uses a standard race layup; UL (435g) reduces resin content for climbing builds; EL (410g) is the minimum weight option with a reduced safety margin for heavier riders or rough road surfaces.

Can I use this rim for a front and rear wheel?

Yes, but note that the asymmetric offset is specifically optimized for rear wheel spoke tension equalization. For front wheels, the offset provides marginal benefit; a symmetric rim of the same profile may be equally suitable for front-only builds.

What spoke count options are available?

Spoke hole count and nipple direction are customizable. Contact the manufacturer with hub specs and intended use case for a recommendation. Standard rear options include 5° and 7° nipple angles.

What is the warranty period?

Bola rims carry a 3-year manufacturer warranty covering structural defects under normal riding conditions within the stated rider weight limit of 120 kg.