Asymmetric Carbon 29er MTB Rim – 23mm High, 26mm Inner Width, XC & Trail, 300–370g (Bola)
Asymmetric Carbon 29er MTB Rim – 23mm High, 26mm Inner Width, XC & Trail, 300–370g (Bola)
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Explore the Performance of the Asymmetric Carbon 29er MTB Rim
This asymmetric carbon rim delivers a 23mm profile height and 26mm inner width in a 29-inch format, purpose-built for cross-country racing and all-mountain trail riding. Available in three weight tiers: Normal (370 ±15g), Superlight (325 ±10g), and Ultralight (300 ±10g) per rim.
Key Specifications
| Parameter | Value |
|---|---|
| Rim Size | 29er (ERD: 589mm) |
| Rim Profile Height | 23mm |
| Outer Width | 32mm |
| Inner Width | 26mm |
| Rim Shape | U-shape (asymmetric) |
| Weight — Normal | 370 ±15g |
| Weight — Superlight | 325 ±10g |
| Weight — Ultralight | 300 ±10g |
| Forward Compressive Strength | >300kg |
| Lateral Torsion Resistance | >50kg |
| Spoke Hole Tension Strength | >280kg |
| Dynamic Equilibrium | <3g |
| Flatness Tolerance | <0.15mm |
| Roundness Tolerance | <0.3mm |
| Nipple Angle | Left 5°, Right 7° (or custom) |
| Valve Hole Diameter | 6.5mm (or custom) |
| Spoke Hole Diameter | 4.5mm (or custom) |
| Assembly Hole Diameter | 7.5mm (or custom) |
| Tire Pressure Range | 45–65 psi |
| Max Rider Weight | 100kg |
Design Rationale: Why Asymmetric?
The asymmetric spoke bed offsets the spoke holes to equalise tension between drive-side and non-drive-side spokes. This reduces the spoke tension differential — a known cause of wheel fatigue and spoke breakage — resulting in a more durable, more evenly loaded wheel structure. The 26mm inner width accommodates 2.2–2.6-inch tubeless tires with an optimal casing spread for grip and rolling efficiency on XC and trail terrain.
Weight Tier Comparison
| Tier | Weight | Best For | Tradeoff |
|---|---|---|---|
| Normal | 370 ±15g | Enduro, aggressive trail, heavier riders | Heavier, but maximises structural margin |
| Superlight | 325 ±10g | All-mountain, trail racing | Balanced weight-to-durability ratio |
| Ultralight | 300 ±10g | XC racing, weight-optimised builds | Thinner layup; suits riders under 75kg and smoother XC trails |
Note: The Ultralight variant is optimised for competitive XC use. Riders above 80kg or riding highly technical, rock-heavy terrain are advised to select the Normal or Superlight tier to maintain structural safety margins.
Customisation Options
- Spoke hole count: configurable on request
- Valve hole diameter: 6.5mm standard or custom
- Spoke hole diameter: 4.5mm standard or custom
- Assembly hole diameter: 7.5mm standard or custom
- Nipple angle: Left 5° / Right 7° standard or custom
Frequently Asked Questions
- What tire widths are compatible with this rim's 26mm inner width?
- A 26mm inner width is ETRTO-compatible with 2.2–2.6-inch (56–66mm) mountain bike tires. It provides an optimal casing spread for both XC race and trail-oriented tires at 45–65 psi tubeless pressures.
- What is the difference between the Ultralight and Normal weight versions?
- The Ultralight (300 ±10g) uses a thinner carbon layup to reduce weight for XC racing. The Normal (370 ±15g) uses a thicker layup for greater impact resistance. Both share identical spoke tension strength (>280kg) and forward compressive strength (>300kg).
- Are asymmetric rims worth it for 29er XC and trail builds?
- Yes. Asymmetric rims equalise drive-side and non-drive-side spoke tension, reducing fatigue-related spoke failure — a measurable advantage in 29er builds where the larger wheel diameter increases spoke tension variance.
- Is this rim tubeless-ready?
- The U-shape profile and 6.5mm valve hole are compatible with tubeless setups. A tubeless rim tape and valve are required and not included.
- What is the maximum rider weight?
- The rated maximum rider weight is 100kg across all weight tiers. Riders approaching this limit are recommended to select the Normal weight variant for maximum structural margin.
- Does Bola offer a warranty on these rims?
- Yes. Bola provides a three-year warranty covering manufacturing defects on carbon rims.
Innovative Asymmetric Design for Enhanced Strength
The asymmetric carbon 29er MTB rim is engineered to provide superior wheel strength and durability. By offsetting the spoke bed, it balances spoke tension more evenly on both sides of the wheel, reducing stress and improving overall stability. This design advantage reduces the risk of rim deformation during aggressive trail and XC rides. Coupled with advanced carbon fiber technology, the rim offers a robust yet lightweight structure, ensuring you can ride hard without worrying about wheel performance. This innovation makes it a top choice for riders seeking reliability on demanding terrain.
Optimal Dimensions for Versatile Trail and XC Riding
With a 23mm height and a 26mm inner width, this asymmetric carbon 29er MTB rim provides an ideal profile for mountain biking enthusiasts. The 26mm inner width accommodates a wide range of tire sizes, enhancing traction and control on varied surfaces. This balance ensures the rim can handle both cross-country speed and technical trail maneuvers effectively. Riders will appreciate the responsive handling and improved tire stability that these dimensions offer, allowing for confident riding in diverse conditions.
Lightweight Construction to Boost Performance
Weighing between 300 and 370 grams, the asymmetric carbon 29er MTB rim is designed to reduce rotational weight, which directly improves acceleration and climbing efficiency. The use of premium carbon fiber materials ensures that the rim remains lightweight without compromising strength. Reduced weight also lowers rider fatigue during long rides and enhances bike agility. This rim is an excellent upgrade for riders seeking to optimize their bike’s performance on both competitive and recreational rides.
