Carbon Fiber Sporting Goods
Bola EXT 40R 700C Carbon Disc Wheelset – 40mm, Hyper Carbon Spokes, 1170g, Ceramic Hub
Bola EXT 40R 700C Carbon Disc Wheelset – 40mm, Hyper Carbon Spokes, 1170g, Ceramic Hub
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The Bola EXT 40R 700C Carbon Disc Wheelset provides a 1170g lightweight solution optimized for road and gravel, combining a T800 UD carbon 40mm rim with 21mm or 24mm internal widths, Hyper carbon spokes, and TPI ceramic hubs for precision power transfer. Engineered for 28–32c tubeless tires and ISO 4210-7 certified, this wheelset meets the needs of professional and endurance cyclists seeking high performance, durability, and stability for racing and mixed terrain.
Technical Specifications
- Rim Depth: 40mm
- Internal Width: 21mm or 24mm
- External Width: 28mm or 30mm
- Material: T800 UD matte carbon fiber
- Spokes: 20/20 Hyper carbon
- Hub: Aluminum BL180 with TPI ceramic bearings and 54T ratchet
- Axle: Center Lock, 12x100mm (front) / 12x142mm (rear)
- Tire Options: Tubeless and clincher (optimized for 28–32c)
- Certifications: ISO 4210-7, REACH compliant
- Weight: 1170g (without rim tape or valves)
Performance & Use Case Comparison
| Feature | Bola EXT 40R | Common Alternatives |
|---|---|---|
| Rim Depth | 40mm | 35-45mm for mixed terrain |
| Internal Width | 21/24mm | 17-27mm; 24mm+ for larger tires |
| Spokes | Hyper carbon | Steel or bladed alloy |
| Hub Bearings | TPI ceramic, 54T ratchet | Stainless cartridge or generic ceramic |
| Weight | 1170g (w/o tape/valves) | 1200-1500g typical |
Use Case Alignment
- Ideal for road racing, gravel events, and endurance rides where low weight and aerodynamics are priorities.
- Accommodates 28–32c tubeless tires for stable performance on mixed and rough surfaces.
- Custom spoke and rim options support precise tuning for small/mid-size cycling brands and professional teams.
Frequently Asked Questions
Are 40mm carbon disc brake wheels suitable for both road and gravel cycling?
Yes. The Bola EXT 40R's 40mm rim depth and available 21mm or 24mm internal width support both road and gravel cycling. This construction balances aerodynamic efficiency with the ability to run wider tires (28–32c), making it versatile for mixed surface riding.
How do Hyper carbon-spoke wheels compare with traditional steel-spoke carbon wheelsets for weight and performance?
Bola's Hyper carbon spokes reduce rotational mass and improve aerodynamic performance compared to standard steel spokes. At 1170g, this wheelset is lighter than many steel-spoke alternatives, offering snappier acceleration while maintaining wheel stiffness and stability.
What are the benefits of TPI ceramic bearings in a bike wheel hub compared with other ceramic bearings?
TPI ceramic bearings are known for their consistent low-friction operation, durability, and tight engineering tolerances. Compared to generic ceramic bearings, TPI components offer better resistance to contamination and less frequent servicing for high-mileage riders.
Is a 21mm or 24mm internal rim width better for tubeless 28–32c tires?
For 28–32c tires, a 24mm internal width maximizes tire stability, cornering support, and reduced pinch flats when run tubeless. 21mm is better suited to riders prioritizing lower weight and narrower tire profiles for road use.
What is the difference among blade, foil, and Hyper carbon spokes on the carbon wheelset?
Blade and foil spokes refer to shape. Hyper carbon spokes are optimized for reducing the weight and air drag; blade and foil are similar, but 'Hyper' additionally considers wind resistance and turbulence, improving efficiency at higher speeds.
