Carbon Fiber Sporting Goods
Bola 29er Carbon DH MTB Rim – 40mm Outer, 32mm Inner, 30mm High
Bola 29er Carbon DH MTB Rim – 40mm Outer, 32mm Inner, 30mm High
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🚚 预计发货：15天内
Bola's 29er Carbon DH MTB Rim features a 40mm outer and 32mm inner width with a 30mm deep profile, optimized for aggressive downhill performance, heavy riders, and competitive endurance cycling. Designed and tested for high-strength and stability using T700/T800 unidirectional carbon fiber, this rim supports tubeless tire systems and advanced spoke lacing for 29-inch mountain bikes.
Key Features & Specifications
- Intended Use: Downhill MTB, enduro, gravity-focused riding
- Rim Size: 29" (ISO 622mm)
- Material: T700/T800 unidirectional carbon fiber with epoxy resin matrix
- Outer Width: 40mm | Inner Width: 32mm
- Profile Height: 30mm
- Weight: 620g (±15g per rim)
- Spoke Count: 28H
- ERD: 579mm
- Valve Hole: 6.5mm Presta (customizable)
- Tire Compatibility: Tubeless-ready, 2.0–2.6" MTB tires
- Max Rider Weight: 120kg
Strength & Precision
| Metric | Value |
|---|---|
| Forward Compressive Strength | >300kg |
| Spoke Hole Tension | >280kg |
| Lateral Torsion Resistance | >50kg |
| Dynamic Balance | <3g |
| Flatness Tolerance | <0.15mm |
| Roundness Tolerance | <0.3mm |
Mounting & Use Cases
- 28-hole design fits standard J-bend and straight-pull spokes (4.5mm spoke hole)
- Wide 32mm inner width maximizes tire stability and traction for aggressive trail and downhill use compared to typical 25-30mm rims
- Tubeless-ready with hookless bead for lower pressures and improved puncture resistance
- Customizable spoke/valve hole diameters available to fit team or OEM builds
Branded Quality
Trusted by cycling professionals and race teams in Europe and North America, Bola rims are rigorously tested according to ISO 4210-7 (impact and fatigue). Durable, sustainable, and quality-focused — engineered for reliability and high performance at accessible pricing.
Compatibility
- Fits 29" / 700c wheel systems
- Supports 2.0–2.6" tubeless MTB tires
- Compatible with Presta valves only (Schrader requires alteration)
Frequently Asked Questions
Is a 29er carbon rim with 40mm width good for downhill mountain biking?
Yes, the 40mm outer/32mm inner width provides a wide tire bed ideal for downhill. It supports modern tire profiles for increased traction and control on steep or technical descents.
What are the benefits of a 32mm inner wide rim for aggressive trail riding?
A 32mm inner rim width allows larger-volume tires to seat with a rounder profile, which improves cornering stability, reduces tire roll, and lowers the chance of pinch flats.
How does a 29-inch carbon DH rim compare to alloy rims for durability?
Compared to most alloy rims, this T700/T800 carbon DH rim offers superior fatigue resistance, lateral stiffness, and higher impact strength due to advanced layup and manufacturing controls. While alloy rims can dent under extreme impacts, carbon maintains structure until failure but is less easily repaired.
Will a 28 spoke carbon MTB rim handle heavy riders on rough descents?
With a 28 spoke build and >300kg compressive strength, this rim is tested for up to 120kg rider weight on DH terrain. Consistent spoke tension is required for maximum performance.
Is this rim compatible with tubeless tires for downhill biking?
Yes, this rim is tubeless-ready and supports standard tubeless tape and valves. Use at least two wraps of 33mm tape for a secure seal with aggressive downhill tires.
