Carbon Fiber Sporting Goods
Bola 700c 50mm Carbon Road Rim – 34mm Wide, 28mm Inner, Tubeless Ready, Disc
Bola 700c 50mm Carbon Road Rim – 34mm Wide, 28mm Inner, Tubeless Ready, Disc
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The Bola 700c 50mm Carbon Road Rim with 34mm outer and 28mm inner width is optimized for racing, endurance, and high-speed performance, supporting 25–32mm tubeless or clincher tires for advanced traction and aerodynamic efficiency at competitive speeds. This disc brake-specific rim features high-modulus carbon fiber construction, verified weights (370–445g by grade), and robust fatigue-tested tolerances, aligning with professional standards for small to medium cycling brands, teams, and experienced riders.
Technical Specifications
- Rim Diameter: 700c (ISO 622mm BSD)
- Profile Height: 50mm
- Outer Width: 34mm
- Inner Width: 28mm
- Effective Rim Diameter (ERD): 538mm
- Rim Shape: U profile (hooked, disc brake only)
- Valve Hole: 6.5mm (customizable)
- Spoke Hole: 4.5mm (customizable)
- Nipple Angle (Front/Rear): 7° (front), 5° or 7° (rear; customizable)
- Weight: 370–445g per rim, dependent on layup grade
- Max Pressure: 100–125 psi
- Rider Weight Limit: ≤120kg
- Material: High-modulus carbon fiber, UV-cure resin
Aerodynamics & Tire Fit Comparison
| Outer Width | Best for Tire Size | Use-case | Aero Advantage |
|---|---|---|---|
| 34mm | 28–32mm | Road racing, Endurance | Minimizes air separation for wider tires at >35km/h |
| 30mm | 25–28mm | Climbing, Weight savings | Optimal for narrower tires and short sprints |
Compatibility & Use-Cases
- Works with both clincher and tubeless tires (use 30mm rim tape for tubeless setup)
- Engineered for modern disc-brake road/gravel bikes
- Supports 25–32mm tires for versatility across road and light gravel surfaces
- Custom spoke hole count and private-label/OEM capability available
Quality, Certifications & Testing
- Forward Compressive Strength: >300kg
- Lateral Torsion Resistance: >50kg
- Spoke Hole Tension: >280kg
- Dynamic Equilibrium: <3g imbalance
- Flatness tolerance: <0.15mm
- Roundness tolerance: <0.3mm
Frequently Asked Questions
Is a 50mm carbon road rim with 34mm outer width good for racing and endurance rides?
The Bola 50mm/34mm rim blends aerodynamic efficiency at high speed and stability for wider tire setups, supporting both competitive racing and long-distance use. Tested fatigue strength and U-shape optimize performance for seasoned racers and endurance cyclists.
How does a 700c 50mm tubeless-ready carbon rim compare to a 45mm rim for performance?
Compared to 45mm rims, the 50mm profile provides improved aerodynamic efficiency at speeds above 35km/h, particularly with 28–32mm tires. However, 45mm rims offer slightly lower crosswind sensitivity and reduced weight (by approx. 20–30g), which can favor climbing and variable wind conditions.
Will a 28mm inner width carbon rim fit 28mm gravel and road tires securely?
Yes, the 28mm inner width safely accommodates 28mm gravel or road tires, providing optimal sidewall support and maximizing both tubeless sealing and ride stability. This width matches recent industry trends for broad-tire setups used in mixed-surface riding.
What are the benefits of using a lightweight 700c carbon rim for disc brakes?
Lightweight carbon construction reduces rotational mass for faster acceleration, while disc-specific engineering eliminates the compromise of a brake track, allowing superior fatigue testing, strength, and weight distribution without sacrificing durability or price point.
Is a 50mm deep, 34mm wide carbon rim worth the price for competitive cyclists?
For competitive cyclists prioritizing aerodynamic performance with modern wide tires (28mm+), this rim delivers a balance of wind-cheating profile, verified strength, and custom build specs uncommon at this price level—especially valuable for private label/OEM or brand partners seeking proven durability and sustainable costs. Tradeoff: marginally higher profile weight, but with tested fatigue ratings and 3-year warranty for peace of mind.
