Carbon Fiber Sporting Goods
29er Hookless Carbon Tubeless MTB Rim – 20mm Profile, 29mm Inner Width, Offset, 325–370g (XC/AM)
29er Hookless Carbon Tubeless MTB Rim – 20mm Profile, 29mm Inner Width, Offset, 325–370g (XC/AM)
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🚚 预计发货：15天内
29er Hookless Carbon Tubeless MTB Rim — 20mm Profile, 29mm Inner Width, Offset Design
A hookless, tubeless-ready 29er carbon rim weighing 325–370g per piece, built for cross-country (XC) and all-mountain (AM) riding. The 29mm inner width accommodates 2.3–2.6" tires at recommended pressures of 45–65 psi, and the asymmetric (offset) spoke bed improves tension balance on the drive side by evening spoke angles across the wheel.
Key Specifications
| Specification | Value |
|---|---|
| Rim Diameter | 29" (622mm BSD) |
| Rim Profile (Height) | 20mm (low profile) |
| Outer Width | 35mm |
| Inner Width | 29mm |
| ERD | 598mm |
| Weight — Standard | 370g ±15g per rim |
| Weight — Superlight | 325g ±10g per rim |
| Rim Shape | U-shape (hookless) |
| Bead Type | Hookless (tubeless only) |
| Valve Hole Diameter | 6.5mm (customizable) |
| Spoke Hole Diameter | 4.5mm (customizable) |
| Assembly Hole Diameter | 7.5mm (customizable) |
| Nipple Direction | Left 5° / Right 7° (offset; customizable) |
| Max Rider Weight | 100kg |
| Tire Pressure Range | 45 psi (min) – 65 psi (max) |
Structural Strength Testing Results
- Forward Compressive Strength: >300kg
- Lateral Torsion Resistance: >50kg
- Spoke Hole Tension: >280kg
- Dynamic Equilibrium (imbalance): <3g
- Flatness Tolerance: <0.15mm
- Roundness Tolerance: <0.3mm
Ride Discipline Fit
- Cross-Country (XC): The superlight 325g option and low 20mm profile minimize rotational weight, reducing energy cost on climbs. Pairs well with 2.2–2.4" XC tires at 50–65 psi.
- All-Mountain (AM): The 29mm inner width supports high-volume 2.4–2.6" casings for better cornering stability and compliance on technical terrain. Recommended tire pressure: 45–52 psi.
Hookless vs. Hooked Rim — Key Tradeoffs
| Feature | Hookless (this rim) | Hooked |
|---|---|---|
| Bead compatibility | Tubeless-only tires (check tire manufacturer approval) | Tubeless and clincher |
| Maximum tire pressure | 65 psi (as specified) | Typically higher (varies) |
| Rim wall weight | Lower (no bead hook machining) | Higher |
| Rim structural integrity | Requires tubeless-rated tires for safe seating | Compatible with wider tire range |
Note: Hookless rims require tubeless-compatible tires. Always verify tire manufacturer's hookless approval before mounting. Maximum tire pressure is 65 psi; exceeding this risks bead failure.
Offset (Asymmetric) Rim Design
The spoke holes are laterally offset (Left 5° / Right 7°) rather than centered on the rim centerline. On a rear wheel, this reduces the tension differential between the drive-side and non-drive-side spokes, producing a more evenly tensioned, laterally stiffer wheel. This is particularly beneficial on 12-speed drivetrains where the cassette forces a steeper drive-side spoke angle.
Warranty & Quality
- Warranty: 3-year manufacturer warranty
- Origin: Manufactured in China by a dedicated carbon rim production facility
- Customization: Hole diameters (valve, spoke, assembly) and nipple offset angles available as custom orders — contact seller before purchase
Frequently Asked Questions
- Q: Is a 29mm inner width carbon rim suitable for all-mountain riding with 2.4" tires?
- A: Yes. A 29mm inner width is well within the recommended range for 2.4" MTB tires (ETRTO recommends an inner width 25–35% of the tire's nominal width). The wider bed improves tire casing support and cornering stability compared to a 25mm rim.
- Q: What tire pressure should I run on a hookless rim?
- A: This rim is rated for 45–65 psi. Most AM/XC tubeless setups run 38–55 psi depending on rider weight and terrain. Do not exceed 65 psi on this hookless rim.
- Q: Can I use a tube with this hookless rim in an emergency?
- A: Hookless rims are not designed for inner tubes. In a field emergency, some riders briefly use a tube at very low pressure to reach safety, but this is not manufacturer-approved and carries a risk of bead unseating.
- Q: How does the offset spoke pattern help on a 29er rear wheel?
- A: The asymmetric hole position shifts the rim's spoke flange reference point, reducing the tension imbalance between drive and non-drive sides. This results in fewer broken spokes and improved lateral rigidity under load.
- Q: What is the difference between the standard (370g) and superlight (325g) versions?
- A: The superlight variant uses a refined carbon layup with tighter tolerances (±10g vs. ±15g), reducing weight by approximately 45g per rim (90g per wheelset). For weight-focused XC racing, the superlight option is recommended; for heavier AM use, the standard version offers a more conservative safety margin.
