Asymmetric Hookless Tubeless Carbon MTB Rim 27.5" | 23mm Inner Width | 23mm Profile | XC & All Mountain | Bola

Bola 27.5" Asymmetric Hookless Tubeless Carbon MTB Rim — 23mm Profile, 23mm Inner Width

The Bola 27.5" asymmetric carbon rim delivers a balance of low weight and structural rigidity optimized for XC and all-mountain riding. At 285–345g per rim (depending on build), it suits riders up to 100kg who demand precise handling without unnecessary rotational mass. The 23mm inner width accommodates 2.2"–2.5" tubeless tires within ETRTO-recommended fitment ranges for hookless rims.

Key Specifications

Structural Testing Data

• Forward Compressive Strength: >300kg
• Lateral Torsion Resistance: >50kg
• Spoke Hole Tension: >280kg
• Dynamic Equilibrium (Imbalance): <3g
• Flatness Tolerance: <0.15mm
• Roundness Tolerance: <0.3mm

Why Asymmetric Rim Design?

Asymmetric spoke drilling offsets the spoke bed toward the non-drive side, equalizing spoke tension between left and right spokes. This reduces the tension imbalance common in standard symmetric rims — particularly relevant on rear wheels where driveside dish significantly misaligns the hub flange geometry. The result is a more evenly stressed, laterally stiffer wheel with reduced risk of spoke fatigue over time.

Hookless Tubeless: Use-Case Suitability

Hookless rims are compatible exclusively with tubeless-ready tires marked as hookless-safe by their manufacturer. At a maximum pressure of 65 psi, this rim is well-suited to XC racing and trail/all-mountain use where tires are typically run at 25–50 psi. Note: hookless rims are not recommended for use with tubed tires or with tires not certified for hookless fitment. Always verify tire compatibility before mounting.

23mm Inner Width: What Tire Widths Does It Support?

A 23mm inner width is optimized for 2.2"–2.5" MTB tires. Per ETRTO guidelines, this inner width produces a measured tire width approximately 4–6mm wider than the rim's inner dimension, giving optimal casing support and cornering stability for trail and XC disciplines. Riders requiring wider tire profiles (>2.6") for enduro or downhill should consider a wider rim platform.

Customization Options

• Hole drilling diameter (spoke, valve, assembly)
• Nipple offset angle
• Superlight or standard layup (285g vs. 345g)
• Compatible with custom branding for OEM and team orders

Frequently Asked Questions

Are hookless carbon rims safe for aggressive trail riding?

Yes, within the rated pressure range (45–65 psi) and with hookless-compatible tires. The tested forward compressive strength exceeds 300kg and spoke hole tension exceeds 280kg, making this rim structurally suitable for trail and all-mountain use. It is not rated for downhill or bike park applications.

Is a 23mm inner width sufficient for all-mountain riding?

For most all-mountain use, yes. A 23mm inner width pairs well with 2.3"–2.4" tires that are standard for trail and all-mountain builds. Riders seeking maximum volume for enduro terrain may prefer a 25–27mm inner width rim.

What is the advantage of asymmetric drilling on this rim?

Asymmetric spoke bed placement equalizes spoke tension across both sides of the wheel. This improves lateral stiffness and reduces the risk of spoke fatigue — a measurable engineering benefit backed by wheel-building data, particularly on rear wheels with significant dish.

What is the weight difference between standard and superlight builds?

The standard layup weighs 345 ± 10g per rim; the superlight variant weighs 285 ± 10g per rim — a 60g per rim saving. For a wheelset, this equates to approximately 120g reduction in rotating mass, which is meaningful for XC racing.

Can this rim be used for OEM or team orders?

Yes. Bola supports customized hole diameters, nipple angles, and branding for small-to-medium cycling brands and professional teams. Contact us directly for MOQ and lead time details.