Carbon Fiber Sporting Goods
Bola 700c Carbon Tubular Rim 50mm x 28mm – 350g Superlight Road Racing
Bola 700c Carbon Tubular Rim 50mm x 28mm – 350g Superlight Road Racing
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Bola 700c Carbon Tubular Rim – 50mm Height, 28mm Wide
The Bola 700c carbon tubular rim delivers a verified superlight option at 350 ± 10 g per rim (standard build: 375 ± 15 g), with a U-shaped cross-section optimised for road racing aerodynamics. Designed for competitive cyclists up to 120 kg, it supports tyre pressures from 100 to 125 psi and is compatible with standard tubular tyre gluing workflows.
Key Specifications
| Parameter | Value |
|---|---|
| Rim diameter | 700c (ISO 622) |
| Rim shape | U-profile |
| Rim height | 50 mm |
| Outer rim width | 28 mm |
| ERD | 539 mm |
| Weight – Standard | 375 ± 15 g |
| Weight – Superlight | 350 ± 10 g |
| Forward compressive strength | > 300 kg |
| Lateral torsion resistance | > 50 kg |
| Spoke hole tension | > 280 kg |
| Dynamic imbalance | < 3 g |
| Flatness tolerance | < 0.15 mm |
| Roundness tolerance | < 0.3 mm |
| Min / Max tyre pressure | 100 / 125 psi |
| Max rider weight | 120 kg |
| Spoke hole diameter | 4.5 mm (customisable) |
| Valve hole diameter | 6.5 mm (customisable) |
| Assembly hole diameter | 7.5 mm (customisable) |
| Nipple angle (front) | 7° |
| Nipple angle (rear) | 5° / 7° (customisable) |
Standard vs. Superlight: Which Should You Choose?
The standard build (375 ± 15 g) suits all-around road racing and gran fondo riders who prioritise durability over marginal weight savings. The superlight build (350 ± 10 g) saves approximately 25 g per rim — 50 g per wheelset — making it the preferred choice for climbers and weight-conscious racers where every gram counts.
Tradeoff note: The superlight layup uses a reduced resin-to-fibre ratio. Riders who frequently train in wet conditions or on rough roads may prefer the standard build for its slightly higher impact tolerance.
Why 28mm Width Matters
At 28 mm outer width, this rim follows the modern wide-rim standard that improves tyre contact patch stability and allows 25–28 mm tubular tyres to mount at their intended profile. Wind-tunnel data from independent rim manufacturers consistently shows that rims wider than the tyre casing reduce aerodynamic drag compared to narrower rims with the same tyre. The 50 mm rim height provides a balance between aerodynamic advantage on flat and rolling terrain and manageable crosswind sensitivity, making it a versatile choice for criterium racing, road racing, and fast sportives.
Compatible Use Cases
- Flat road racing & criteriums: 50 mm depth provides meaningful aero gains without excessive crosswind penalty
- Climbing & mountain stages: Superlight build at 350 g keeps rotating mass low; U-profile maintains structural stiffness
- Gran fondo / endurance riding: Standard 375 g build balances weight and long-term durability
- Track / velodrome use: Tubular-only mounting, no braking surface (disc/track configuration)
Frequently Asked Questions
- What is the best tubular carbon rim for road cycling under 400 grams?
- The Bola 700c superlight tubular rim weighs 350 ± 10 g per rim, placing it well under the 400 g threshold. The standard build at 375 ± 15 g also qualifies. Both are full carbon construction.
- Is a 50mm carbon rim good for both climbing and flat road racing?
- Yes. A 50 mm depth is widely regarded as an all-round racing depth. It delivers measurable aerodynamic advantage on flat and rolling roads while remaining manageable for most riders in crosswinds. For dedicated mountain-stage climbing, a shallower rim (30–38 mm) would save more rotating weight.
- What is the difference between the superlight and standard weight options?
- The superlight build is approximately 25 g lighter per rim (350 g vs. 375 g). Both share identical dimensions and structural geometry. The standard build may offer marginally greater impact resilience for rougher training conditions.
- Are 28mm wide carbon rims better than 25mm for aerodynamics and stability?
- For tyre widths of 25 mm and above, a 28 mm rim provides a more aerodynamically optimised tyre-to-rim junction and improved cornering stability. Narrower 25 mm rims can create a 'lightbulb' tyre profile that increases drag. The 28 mm outer width on this rim is best paired with 25–28 mm tubular tyres.
- What should I look for when buying 700c carbon tubular rims for competitive cycling?
- Key factors: rim weight (under 400 g for climbing; 350–380 g is competitive), rim depth (50 mm suits most road racing), width (28 mm is the modern aero standard), structural strength metrics (this rim: >300 kg forward compression, >280 kg spoke tension), and rim flatness/roundness tolerances (<0.15 mm / <0.3 mm confirm build quality).
- Can I use this rim with a disc brake or rim brake setup?
- This is a tubular-only rim with no dedicated brake track. It is intended for disc brake or track (brakeless) builds. It is not suitable for rim brake use.
