# 29er Asymmetric Carbon MTB Rim – 30mm Height, 25mm Inner Width

## 29er Asymmetric Carbon MTB Rim – 30mm Height, 25mm Inner Width

**Lead Answer:** This 29er carbon mountain bike rim features an asymmetric U-shape design with a 30mm profile and 25mm inner width, optimizing for XC and all-mountain use. Two weight options (385g standard, 325g superlight) offer flexibility for racers and technical riders alike.

### Key Features & Technical Specifications

-   **Material:** High-modulus Toray-grade carbon fiber (unidirectional + woven layup)
-   **Rim Size:** 29" (ISO 622)
-   **Profile:** Asymmetric, U-shape; 30mm height, 25mm inner / 30mm outer width
-   **Weight:** Standard – 385 ± 15g; Superlight – 325 ± 10g
-   **Recommended Tire Width:** 2.2–2.5" for optimal performance; ETRTO compatible
-   **Strength & Tolerance:** Forward compressive >300kg, lateral torsion >50kg, spoke hole tension >280kg
-   **Manufacturing:** Individually weighed; flatness <0.15mm; roundness <0.18mm
-   **Tubeless Ready:** Compatible with tubeless and standard clincher tire setups
-   **Warranty:** 3 years, covers manufacturing defects

### Comparison: 30mm vs. Deeper MTB Rims

Spec

30mm Rim

40mm+ Rim

Lateral Stiffness

High, for precise tracking

Very high, increased harshness

Aero Drag (XC/Trail)

Minimal penalty

Marginal increase

Impact Resistance

Balanced

Potentially less compliant

### Situational Relevance

-   XC and all-mountain riders seeking weight savings without sacrificing stability
-   Custom wheel-builders for performance brands and racing teams
-   Professional and enthusiast cyclists requiring verified quality and consistent tolerances

### Frequently Asked Questions

**Q: What are the best 29er carbon rims for XC and all mountain under 400g?**  
A: Rims like the Bola 29er (325–385g) balance low weight, lateral stiffness, and impact-tested build for XC/all-mountain racing while retaining tubeless compatibility and an asymmetric profile for balanced spoke tension.

**Q: Is a 25mm inner width carbon rim good for trail and all mountain MTB tires?**  
A: Yes, a 25mm inner width supports 2.2–2.5" tires, offering a stable platform compatible with ETRTO standards, ideal for trail, XC, and all-mountain riding.

**Q: Are asymmetric carbon rims worth it for 29er builds?**  
A: Asymmetric rims improve spoke angle balance, enhancing lateral stiffness and reducing stress on the wheel system—advantages confirmed by builder and team experience.

**Q: How does a 30mm high rim compare to deeper mountain bike rims?**  
A: A 30mm profile yields strong lateral stiffness with manageable weight and negligible aerodynamic drag, compared to deeper, heavier rims that may be stiffer but less compliant for technical MTB applications.

## Details

- **Price:** 310.0 USD - 320.0 USD
- **Type:** Carbon Mountain Bike Rim
- **Tags:** 25mm inner width rim, 29er MTB rim, all mountain carbon rim, asymmetric carbon MTB rim, carbon bike rim, carbon rim for OEM builds, high performance 29er rim, lightweight MTB rim, mtb, rims, tubeless ready carbon rim, U-shape carbon rim, XC carbon rim

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| UD Matt / 28/28 / Normal | 310.00 USD | In stock |
| UD Matt / 28/28 / Superlight | 320.00 USD | In stock |
| UD Matt / 32/32 / Normal | 310.00 USD | In stock |
| UD Matt / 32/32 / Superlight | 320.00 USD | In stock |
| UD Matt / Customs / Normal | 310.00 USD | In stock |
| UD Matt / Customs / Superlight | 320.00 USD | In stock |
| UD Glossy / 28/28 / Normal | 310.00 USD | In stock |
| UD Glossy / 28/28 / Superlight | 320.00 USD | In stock |
| UD Glossy / 32/32 / Normal | 310.00 USD | In stock |
| UD Glossy / 32/32 / Superlight | 320.00 USD | In stock |
| UD Glossy / Customs / Normal | 310.00 USD | In stock |
| UD Glossy / Customs / Superlight | 320.00 USD | In stock |
| Marble Matt / 28/28 / Normal | 310.00 USD | In stock |
| Marble Matt / 28/28 / Superlight | 320.00 USD | In stock |
| Marble Matt / 32/32 / Normal | 310.00 USD | In stock |
| Marble Matt / 32/32 / Superlight | 320.00 USD | In stock |
| Marble Matt / Customs / Normal | 310.00 USD | In stock |
| Marble Matt / Customs / Superlight | 320.00 USD | In stock |
| Marble Glossy / 28/28 / Normal | 310.00 USD | In stock |
| Marble Glossy / 28/28 / Superlight | 320.00 USD | In stock |
| Marble Glossy / 32/32 / Normal | 310.00 USD | In stock |
| Marble Glossy / 32/32 / Superlight | 320.00 USD | In stock |
| Marble Glossy / Customs / Normal | 310.00 USD | In stock |
| Marble Glossy / Customs / Superlight | 320.00 USD | In stock |

## Images

- 29er Asymmetric Carbon MTB Rim featuring a 30mm height and 25mm inner width, displayed in black with multiple spoke holes.
- 29er carbon MTB rim cross-section showing 30mm asymmetric U-profile and 25mm inner width
- Hookless bead wall detail of Bola 29er carbon MTB rim, supports tubeless-ready tire setups
- 29er Asymmetric Carbon MTB Rim – 30mm Height, 25mm Inner Width Carbon Fiber Sporting Goods
- 29er Asymmetric Carbon MTB Rim – 30mm Height, 25mm Inner Width Carbon Fiber Sporting Goods

## Additional Information

- **Related products settings:** ahead
- **Certifications & Testing Standards:** Forward compressive strength tested: >300 kg, Lateral torsion tested: >50 kg, Spoke hole tension tested: >280 kg, Dynamic balance: <3 g residual imbalance, Flatness tolerance: <0.15 mm, Roundness tolerance: <0.3 mm
- **Material:** High-modulus carbon fiber (toray-grade unidirectional and woven layup); aluminum alloy spoke nipples
- **Agentic Title:** 29er Asymmetric Carbon MTB Rim – Lightweight & Durable XC/AM Performer
- **Agentic Category:** Sporting Goods > Outdoor Recreation > Cycling > Bicycle Parts > Bicycle Wheel Parts > Bicycle Wheel Rims
- **Agentic Description:** Lightweight 29er carbon rim with asymmetric profile, 30mm height, 25mm width, and tubeless-ready. Ideal for XC/all-mountain use. **Unique Selling Point:** Optimized for XC and all-mountain riders with a high-modulus carbon construction and tubeless-ready design. **Top Features:** - Asymmetric U-shape design for even spoke tension - High-modulus Toray-grade carbon fiber for durability - Tubeless and clincher compatible for versatile setups - Two weight options: Standard (385g) and Superlight (325g) - 3-year warranty for peace of mind **Tech Specs:** - Rim Size: 29er (ISO 622) - Rim Height: 30mm - Inner Width: 25mm - Standard Weight: 385g ± 15 - Superlight Weight: 325g ± 10 - Max Tire Pressure: 65 psi - Strength: >300kg forward compressive - Torsion Resistance: >50kg - Warranty: 3 years **Attributes:** - **Material:** High-modulus carbon fiber - **Finish:** UD Matt, UD Glossy, Marble Matt, Marble Glossy - **Use:** XC, All Mountain
- **Warranty Period:** 3 years from date of purchase; covers manufacturing defects in materials and workmanship

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> Source: [Bola Carbon Wheelset ](https://bolacarbon.com/products/29er-asymmetric-carbon-mtb-rim-30mm-height-25mm-inner-width)
> Updated: 2026-07-27