Carbon Fiber Sporting Goods
700c Tubeless Carbon Road Rim 45mm – 36mm Outer / 30mm Inner Wide, 375–450g Weight Options | Bola
700c Tubeless Carbon Road Rim 45mm – 36mm Outer / 30mm Inner Wide, 375–450g Weight Options | Bola
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Bola 700c Tubeless Carbon Road Rim – 45mm Profile
The Bola 45mm carbon rim delivers a 36mm outer / 30mm inner wide tubeless-ready platform for 700c road and gravel wheels. Four factory weight tiers — from 450g (standard) down to 375g (extreme light) — let builders match rim mass to rider priority without compromising structural compliance. Forward compressive strength exceeds 300 kg; spoke hole tension exceeds 280 kg.
Key Specifications
| Specification | Value |
|---|---|
| Rim Size | 700C |
| Rim Profile | U / UV Shape |
| Rim Height | 45 mm |
| Outer Width | 36 mm |
| Inner Width | 30 mm |
| ERD | 548 mm |
| Valve Hole Diameter | 6.5 mm (customizable) |
| Spoke Hole Diameter | 4.5 mm (customizable) |
| Assembly Hole Diameter | 7.5 mm (customizable) |
| Tire Pressure Range | 100–125 psi |
| Max Rider Weight | 120 kg |
| Dynamic Equilibrium | <3 g imbalance |
| Flatness Tolerance | <0.15 mm |
| Roundness Tolerance | <0.3 mm |
| Nipple Direction (Front) | 7° |
| Nipple Direction (Rear) | 5° & 7° (customizable) |
Weight Tier Comparison
| Tier | Weight per Rim | Best For |
|---|---|---|
| Normal | 450 ± 15 g | Training, durability-priority builds |
| Super Light | 425 ± 10 g | All-round performance builds |
| Ultra Light | 395 ± 10 g | Climbing and criterium racing |
| Extreme Light | 375 ± 10 g | Maximum weight saving; use with experienced builders |
Tradeoff note: Lighter tiers reduce layup thickness. For riders over 90 kg or those using high-torque disc brakes, the Normal or Super Light tier is recommended for long-term reliability.
Tire & Compatibility
The 30mm inner width (ETRTO-aligned) optimally accommodates 28c–38c tubeless road and gravel tires. Rim is tubeless-ready with a sealed bed; standard tubeless tape and valves required. Compatible with both rim-brake and disc-brake builds depending on variant selected.
Structural Testing Data
- Forward Compressive Strength: >300 kg
- Lateral Torsion Resistance: >50 kg
- Spoke Hole Tension: >280 kg
- Dynamic Equilibrium: <3 g
- Flatness: <0.15 mm
- Roundness: <0.3 mm
Customization Options
- Valve hole diameter: 6.5 mm standard or custom
- Spoke hole diameter: 4.5 mm standard or custom
- Assembly hole diameter: 7.5 mm standard or custom
- Nipple angle: custom configurations available on request
- Drilling count: contact Bola for OEM/custom spoke counts
Frequently Asked Questions
- What tire width is best for a 30mm inner wide rim?
- A 30mm inner width supports 28c–38c tires optimally under ETRTO guidelines, with 32c being a common choice for mixed road/gravel use. Narrower 25c tires are not recommended on this rim width.
- How does the 36mm outer width affect aerodynamics?
- A wider outer rim creates a smoother air-transition to modern wide tires (28c+), reducing turbulence at the tire-rim junction. This can offer measurable aero gains over narrower rims when paired with 28c or wider tires at road cycling speeds (30–50 km/h).
- Which weight tier should I choose for racing vs. training?
- For racing and climbing, Ultra Light (395 g) or Extreme Light (375 g) minimize rotational mass. For training or riders over 90 kg, Normal (450 g) or Super Light (425 g) provide greater fatigue resistance over time.
- Is this rim tubeless-ready out of the box?
- Yes. The rim bed is sealed for tubeless use. You will need to add compatible tubeless tape and a tubeless valve (not included).
- What is the maximum rider weight?
- Bola rates this rim for riders up to 120 kg. Heavier riders should select the Normal weight tier and consult Bola for build recommendations.
- Can spoke hole and valve hole dimensions be customized?
- Yes. Standard diameters are 4.5 mm (spoke), 6.5 mm (valve), and 7.5 mm (assembly). Custom dimensions are available — contact Bola directly with your specifications.
