Carbon Fiber Sporting Goods
Bola 700C Carbon Tubular Rim – 35mm Profile, 28mm Wide, Asymmetric, 300g Superlight
Bola 700C Carbon Tubular Rim – 35mm Profile, 28mm Wide, Asymmetric, 300g Superlight
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Bola 700C Carbon Tubular Rim – 35mm Profile, 28mm Wide
The Bola 700C carbon tubular rim delivers a verified superlight weight of 300 ± 10g per rim in its superlight build (standard: 325 ± 15g), a 35mm aerodynamic profile, and a 28mm outer width with an optional asymmetric spoke drilling pattern. Designed for competitive road cyclists and triathletes seeking a balance of climbing efficiency and flat-road aerodynamics. Maximum supported rider weight: 120 kg.
Key Specifications
| Specification | Value |
|---|---|
| Rim Size | 700C |
| Rim Shape | U-Shape |
| Rim Profile Height | 35mm |
| Outer Width | 28mm |
| ERD (Effective Rim Diameter) | 568mm |
| Weight – Standard Build | 325 ± 15g |
| Weight – Superlight Build | 300 ± 10g |
| Tire Compatibility | Tubular only |
| Min / Max Tire Pressure | 100 / 125 psi |
| Max Rider Weight | 120 kg |
Structural Strength Data
| Test Parameter | Result |
|---|---|
| Forward Compressive Strength | > 300 kg |
| Lateral Torsion Resistance | > 50 kg |
| Spoke Hole Tension | > 280 kg |
| Dynamic Equilibrium (imbalance) | < 3g |
| Flatness Tolerance | < 0.15mm |
| Roundness Tolerance | < 0.3mm |
Drilling & Compatibility Details
- Assembly Hole Diameter: 7.5mm (customizable)
- Valve Hole Diameter: 6.5mm (customizable)
- Spoke Hole Diameter: 4.5mm (customizable)
- Nipple Direction: Front 7°; Rear 5° & 7° (customizable)
- Asymmetric Option: Available – improves spoke tension balance on rear drive-side wheels
Performance Tradeoffs to Know
The 35mm profile offers a practical compromise: lower aerodynamic drag than 50mm+ deep-section rims while remaining manageable in crosswind conditions above 40 km/h. The 28mm outer width supports modern 25–30mm tubular tires for improved contact patch and rolling resistance. Note: this rim is tubular-only and is not compatible with clincher or tubeless tires.
Frequently Asked Questions
- Is a 35mm carbon rim good for both climbing and flat road cycling?
- Yes. At 300–325g per rim, the 35mm profile minimizes rotational weight penalty on climbs while providing measurable aerodynamic benefit on flat and rolling terrain — making it a versatile all-around race rim.
- What is the advantage of the asymmetric option?
- Asymmetric spoke drilling offsets the rim bed laterally, equalizing spoke tension between the drive and non-drive sides on rear wheels. This reduces spoke fatigue and improves wheel durability under load.
- How does the 28mm outer width affect tire performance?
- A 28mm outer width creates a more favorable tire-to-rim ratio with 25–30mm tubular tires, reducing aerodynamic drag at the tire shoulder junction and lowering rolling resistance compared to narrower 23–24mm rims.
- What is the maximum tire pressure for this rim?
- The rim is rated for 100–125 psi with tubular tires. Exceeding 125 psi is not recommended.
- Can spoke hole count and drilling be customized?
- Yes. Assembly hole, valve hole, and spoke hole diameters are all customizable. Nipple direction (front and rear) is also available in custom configurations — contact Bola for custom build requirements.
