Carbon Fiber Sporting Goods
Bola 700C 28mm Carbon Road Rim – 45mm / 50mm Depth, 21-Hole, U-Shape, Tubeless Ready
Bola 700C 28mm Carbon Road Rim – 45mm / 50mm Depth, 21-Hole, U-Shape, Tubeless Ready
Couldn't load pickup availability
Bola 700C 28mm Carbon Road Rim — 45mm & 50mm Depth Options
The Bola 700C carbon road rim delivers a verified 360–440g per-piece weight range across four factory weight tiers, paired with a 28mm outer / 22mm inner U-shape profile optimised for tubeless-ready setups. Available in 45mm and 50mm wave-profile depths, it suits riders choosing between climbing efficiency and flat-course aerodynamics. Designed for riders up to 120 kg, tested to >300 kg forward compressive strength and >280 kg spoke hole tension.
Why Choose the 45mm vs 50mm Depth?
- 45mm depth: Preferred for mixed-terrain, climbing stages, and variable crosswind conditions. Lower aerodynamic drag in hilly or technical courses.
- 50mm depth: Optimised for flat criteriums, time trials, and high-speed road racing where sustained aerodynamic gain outweighs marginal weight increase.
Weight Tiers — Verified Per-Piece Figures
| Tier | Weight (per rim) | Best For |
|---|---|---|
| Standard | 440 ± 15 g | Training, endurance, heavier loads |
| Superlight | 405 ± 10 g | Competitive road racing, gran fondos |
| Ultralight | 385 ± 10 g | Elite road racing, lightweight build targets |
| Extreme Light | 360 ± 10 g | Maximum weight savings; rider weight <90 kg recommended |
Note: Extreme Light tier is engineered for competitive racing conditions. For daily training or riders above 90 kg, Superlight or Standard tiers offer a more durable service life without measurable performance compromise.
Full Technical Specifications
- Rim Diameter: 700C (ETRTO 622)
- Rim Shape: U-shape (tubeless compatible)
- Outer Width: 28 mm
- Inner Width: 22 mm
- Rim Height: 45 mm or 50 mm (wave profile)
- ERD: 545 mm
- Spoke Holes: 21H — Hole Dia: 4.5 mm (customisable)
- Valve Hole Dia: 6.5 mm (customisable)
- Assembly Hole Dia: 7.5 mm (customisable)
- Nipple Direction: Front 7°; Rear 5° and 7° (or custom)
- Forward Compressive Strength: >300 kg
- Lateral Torsion: >50 kg
- Spoke Hole Tension: >280 kg
- Dynamic Equilibrium: <3 g
- Flatness: <0.15 mm
- Roundness: <0.3 mm
- Tyre Pressure Range: 100–125 psi
- Max Rider Weight: 120 kg
Customisation Options
Bola rims are available with custom spoke hole count, nipple direction, valve hole sizing, and branding finishes. Suitable for OEM partnerships with small-to-medium cycling brands and professional teams across Europe and North America. Minimum order quantities and lead times available on request.
Frequently Asked Questions
- Are these rims safe for everyday riding, not just racing?
- Yes. The Standard (440 g) and Superlight (405 g) tiers are engineered for consistent daily use with a forward compressive strength exceeding 300 kg and spoke tension tolerance above 280 kg. Extreme Light (360 g) is optimised for race-day conditions and is best paired with a controlled build by an experienced wheel builder.
- What is the difference between the 45mm and 50mm depth for climbing vs flat racing?
- The 45mm depth reduces aerodynamic drag in variable wind and climbing conditions, making it the preferred choice for mixed-profile race routes. The 50mm depth provides measurable aerodynamic gain on flat or rolling terrain where crosswind stability is manageable.
- How much does a quality ultralight carbon rim weigh?
- The Bola Ultralight tier is verified at 385 ± 10 g per rim — competitive within the premium 700C carbon rim segment for this spoke count and width class.
- What spoke count and ERD should I use for a 21-hole build?
- The Bola 700C rim uses a 21-spoke configuration with an ERD of 545 mm, a 4.5 mm spoke hole diameter, and supports both 5° and 7° nipple angles at the rear — providing flexibility for custom lacing patterns.
- Is this rim tubeless ready?
- The 22 mm inner width U-shape profile is tubeless compatible. A tubeless tape and valve (not included) are required for a tubeless setup. Max tyre pressure is 125 psi.
