Carbon Fiber Sporting Goods
Bola 30mm Inner Width Tubeless Ready Carbon Road Rim – 700C, 30mm High, 335–420g
Bola 30mm Inner Width Tubeless Ready Carbon Road Rim – 700C, 30mm High, 335–420g
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Bola 30mm Inner Width Tubeless Ready Carbon Road Rim — 700C
A 700C carbon road rim with a 30mm inner width and 30mm profile height, designed for tubeless-ready builds on road, endurance, and light gravel setups. Available in four weight tiers — from a race-optimised 335 g to a training-grade 420 g — letting riders balance durability and weight savings based on their use case.
Key Specifications
| Specification | Value |
|---|---|
| Wheel Standard | 700C |
| Rim Shape | U / V Profile |
| Rim Height | 30 mm |
| Outer Width | 36 mm |
| Inner Width | 30 mm |
| ERD | 578 mm |
| Valve Hole Diameter | 6.5 mm (customisable) |
| Spoke Hole Diameter | 4.5 mm (customisable) |
| Assembly Hole Diameter | 7.5 mm (customisable) |
| Nipple Direction (Front / Rear) | 7° / 5° & 7° (customisable) |
| Min / Max Tyre Pressure | 100 / 125 psi |
| Max Rider Weight | 100 kg |
| Flatness Tolerance | < 0.15 mm |
| Roundness Tolerance | < 0.3 mm |
| Dynamic Balance | < 3 g |
Weight Variants
| Tier | Weight (per rim) | Recommended Use |
|---|---|---|
| Normal | 420 ± 15 g | Training, commuting, everyday builds |
| Superlight | 380 ± 10 g | Endurance racing, gran fondo |
| Ultralight | 355 ± 10 g | Road racing, climbing-focused builds |
| Extreme Light | 335 ± 10 g | Elite racing, strict weight-limit builds (< 100 kg rider) |
Structural Strength Data
- Forward Compressive Strength: > 300 kg
- Lateral Torsion Resistance: > 50 kg
- Spoke Hole Tension: > 280 kg
Why 30mm Inner Width?
A 30 mm inner width supports tyre widths from 25 mm up to 40 mm, complying with ETRTO 2020 guidelines that recommend inner rim width ≥ 105% of the mounted tyre's casing width. Compared to traditional 19–21 mm inner-width rims, the wider bed reduces tyre sidewall pinch, lowers rolling resistance on 28–32 mm tyres, and improves cornering stability at lower pressures — a measurable advantage for endurance road and mixed-surface riding.
Tradeoff to consider: The 36 mm outer width adds marginal aerodynamic drag vs. a narrower 28 mm outer rim at speeds below 35 km/h, but delivers superior tyre support and tubeless seating reliability.
Tubeless Compatibility
The rim bed is machined for tubeless-ready (TLR) tape and valve compatibility. The 6.5 mm valve hole accepts standard 44 mm and 60 mm tubeless valves. Sealant capacity is sufficient for 28–38 mm tyre volumes.
Frequently Asked Questions
- Is this rim suitable for gravel riding?
- Yes. The 30 mm inner width accommodates tyres up to 40 mm, and the 100–125 psi pressure range supports both road and light gravel tyre pressures. For aggressive gravel use, the Normal (420 g) or Superlight (380 g) tier is recommended for added impact resistance.
- What is the safe weight limit for the Extreme Light (335 g) variant?
- The Extreme Light rim is rated for riders up to 100 kg (combined rider + gear weight). The spoke hole tension rating of > 280 kg and compressive strength of > 300 kg apply across all weight tiers, but reduced wall thickness in the Extreme Light variant makes it best suited to smooth road surfaces and controlled racing conditions.
- How does this rim compare to a traditional 25 mm outer-width rim for aerodynamics?
- At the 30 mm profile height, aerodynamic gains over a shallow 25 mm rim are modest (most wind tunnel data shows < 5 W savings below 45 km/h). The primary advantage of this rim is tyre volume optimisation and tubeless reliability rather than deep-section aero performance.
- What spoke count and nipple types are compatible?
- The 4.5 mm spoke holes are compatible with standard J-bend and straight-pull spokes. Nipple direction is 7° front and 5°/7° rear (customisable on request), suitable for 2-cross and 3-cross lacing patterns on most road and endurance hubs.
- Does this rim come with a warranty?
- Yes. Bola offers a 3-year manufacturer warranty covering structural defects. Warranty is valid for riders within the 100 kg weight limit using tyres within the specified 100–125 psi pressure range.
