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

Discover the 27.5 Inch Asymmetric Tubeless Rim for Superior MTB Performance

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.

Innovative Design for Enhanced Strength and Stability

The 27.5 inch asymmetric tubeless rim by Bola is engineered to offer unmatched strength and optimized spoke tension for your mountain bike. Asymmetry in the rim profile balances the tension between the drive and non-drive sides, reducing stress on spokes and improving wheel durability. Constructed from lightweight carbon fiber, this hookless tubeless rim has a 23mm inner width and 23mm profile, providing a solid platform for tire mounting and better traction on rough terrain. Whether you are into cross-country (XC) or all mountain riding, this rim helps maintain consistent performance without compromising weight or power transfer.

Hookless Tubeless Technology for Reliable and Lightweight Riding

Leveraging the benefits of hookless rim technology, the 27.5 inch asymmetric tubeless rim ensures effortless tubeless tire installation and superior air retention. Hookless rims create a secure seal with tubeless tires, reducing the likelihood of pinch flats and allowing lower tire pressures for improved ride comfort and traction. This design reduces rim weight by eliminating the hook, contributing to quicker acceleration and responsive handling. Bola’s carbon construction enhances stiffness and shock absorption while keeping the weight at a minimum, making it ideal for both XC racers and all-mountain enthusiasts seeking reliable, high-performance equipment.

Optimized Dimensions Perfect for XC and All Mountain Riding

With a 23mm inner width and profile, this 27.5 inch asymmetric tubeless rim strikes the perfect balance between wide tires and weight savings. The rim width accommodates a variety of tire sizes, providing enhanced sidewall support and greater stability in technical terrain without unnecessary bulk. This flexibility allows riders to customize tire pressure and tread options tailored to their style and trail conditions. Designed specifically with cross-country and all-mountain riders in mind, Bola’s rim delivers precise handling, durability, and comfort across diverse mountain biking environments, making it a top choice for riders demanding versatility and performance.