Carbon Fiber Sporting Goods
Bola 700c Tubular Carbon Rim | 45mm Deep, 28mm Wide | Standard & Asymmetric
Bola 700c Tubular Carbon Rim | 45mm Deep, 28mm Wide | Standard & Asymmetric
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Bola 700c Tubular Carbon Rim — 45mm Deep, 28mm Wide
The Bola 700c tubular carbon rim delivers a 45mm aerodynamic profile and 28mm outer width in a U-shape cross-section, weighing 330–370g per rim depending on build specification. Available in standard and asymmetric drilling configurations, it is designed for competitive road racing, criterium, and triathlon disciplines. Maximum rider weight: 120kg.
Key Specifications
| Parameter | Value |
|---|---|
| Rim Standard | 700c (ISO 622) |
| Rim Type | Tubular (tub) |
| Profile Shape | U-shape |
| Rim Height | 45mm |
| Outer Width | 28mm |
| ERD | 549mm |
| Normal Build Weight | 355g ± 15g per rim |
| Superlight Build Weight | 330g ± 10g per rim |
| Forward Compressive Strength | >300kg |
| Lateral Torsion | >50kg |
| Spoke Hole Tension | >280kg |
| Dynamic Equilibrium | <3g |
| Flatness Tolerance | <0.15mm |
| Roundness Tolerance | <0.3mm |
| Min / Max Tyre Pressure | 100 / 125 psi |
| Valve Hole Diameter | 6.5mm (customisable) |
| Spoke Hole Diameter | 4.5mm (customisable) |
| Assembly Hole Diameter | 7.5mm (customisable) |
| Nipple Direction (Front) | 7° |
| Nipple Direction (Rear) | 5° or 7° (customisable) |
| Max Rider Weight | 120kg |
Standard vs. Asymmetric Option
The standard drilling pattern suits symmetrical hub flanges and even spoke tension distribution. The asymmetric drilling option offsets spoke holes laterally — typically 2–3mm — to equalise tension between drive-side and non-drive-side spokes on rear wheels, reducing lateral flex and improving wheel stiffness under power. This is particularly relevant for riders building high-tension rear wheels for criterium or time-trial use.
Tradeoff to note: The asymmetric pattern limits compatible hub selection and requires careful spoke-length calculation. Confirm hub flange geometry before ordering.
Intended Use Cases
- Road racing & criterium: The 45mm depth provides aerodynamic benefit at speeds above 35km/h while the U-shape retains structural stiffness for sprint loads.
- Triathlon & time trial: Compatible with deep-section aero builds; 28mm outer width supports modern tyre-to-rim aerodynamic integration.
- Lightweight climbing builds: The superlight 330g ± 10g specification is competitive for sub-350g tubular rim climbing wheels.
Frequently Asked Questions
- Q: Is a 45mm deep 28mm wide carbon tubular rim good for climbing?
- A: At 330g in the superlight build, this rim is viable for climbing wheelsets. The 45mm depth adds minor aerodynamic drag on steep gradients versus shallower profiles, but the weight is competitive with other sub-350g tubular rims at this depth.
- Q: What is the difference between asymmetric and standard tubular carbon rims?
- A: Asymmetric rims offset the spoke bed to balance spoke tension across unequal flange-to-centreline distances — most critical on rear wheels with cassette-side offset. Standard rims have a centred spoke bed and are compatible with a wider range of hubs.
- Q: Are superlight carbon tubular rims worth it compared to standard carbon rims?
- A: The superlight build saves approximately 25g per rim (330g vs 355g). For a pair, this is a ~50g saving — meaningful for weight-sensitive climbing or time-trial builds, at a typically higher cost per rim. Structural tolerances (flatness <0.15mm, roundness <0.3mm) remain identical across both builds.
- Q: What tyre pressure range does this rim support?
- A: Minimum 100 psi, maximum 125 psi for tubular tyres. Do not exceed 125 psi.
- Q: What is the maximum rider weight?
- A: 120kg total system weight (rider + equipment).
