Front wheel axle 12x100 Shimano Ultegra

Shimano Ultegra SM-AX720: the 12x100 thru axle that makes a difference

In the demanding world of road cycling, every component matters. Whether it's frame stiffness, rim aerodynamics, or hub responsiveness, each part contributes to performance. One often-overlooked yet crucial element is the thru axle. Today, let’s take a closer look at one of the most reliable models on the market: the Shimano Ultegra SM-AX720 12x100 thru axle.

What is a thru axle ?

Unlike traditional quick-release skewers, a thru axle passes directly through the hub and threads into the fork or frame, providing superior wheel stiffness and enhanced alignment. This translates to better handling, improved braking performance, and more efficient power transfer—key benefits for any road cyclist.

SM-AX720: built for the road, engineered for performance

The Ultegra SM-AX720 is Shimano’s front thru axle, developed as part of their renowned Ultegra series—trusted for its precision, reliability, and race-ready design. Let’s break down its technical specifications:

• Diameter: 12 mm

• Length: 100 mm (standard front road axle)

• Compatibility: front road forks with 12x100 mm thru axle standard

• Locking system: internal cam (E-thru system), secure and discreet

• Material: high-quality aluminum for the perfect balance of strength and low weight

• Weight: approx. 71 g

Why choose a 12x100 thru axle from Shimano ?

Improved lateral stiffness

Whether you’re sprinting out of the saddle or descending at speed, front-end stiffness is crucial. The SM-AX720 ensures tight clamping of the front hub, enhancing road feel and steering precision.

Perfect disc brake alignment

With disc brakes now standard on modern road bikes, caliper alignment is essential. Shimano’s E-thru system allows for accurate repositioning of the wheel, ensuring your rotor is always centered.

Quick and tool-free installation

No tools needed! The axle tightens by hand, using an internal cam lever that folds away neatly after use. It’s a clean, secure, and efficient system, whether you're at home or on the roadside.

Compatibility and setup

The Shimano SM-AX720 fits most modern road bike forks using the 12x100 mm thru axle standard. It’s ideal for bikes equipped with disc brake wheels and thru axle hubs, now commonplace in both performance and endurance models.

Tip: Always double-check your fork specs before ordering. 12x100 mm is the current standard for front thru axles on road bikes, especially those with disc brakes.

In summary: a small part with a big impact

The Shimano SM-AX720 12x100 thru axle stands out as a must-have for cyclists who prioritize precision, safety, and performance. With it, your front wheel becomes a seamless extension of your fork, delivering stable, confident handling on any road.

Whether you're prepping for a sportive or riding for pleasure, this axle is a small upgrade that offers a big boost in reliability.

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