Axes

Boosted vs. Regular and New Through Axles The evolution of axle standards in mountain biking has led to the introduction of 'Boosted' axles and new through-axle systems, each offering distinct advantages over traditional setups. Boosted Axles Boosted axles are a newer standard in mountain biking, characterized by wider hub spacing. For the front, the spacing is 110mm (up from the standard 100mm), and for the rear, it's 148mm (increased from 135mm or 142mm). This wider spacing allows for a more substantial wheel build, as it increases the bracing angle of the spokes. The result is a stiffer, more robust wheel that can handle greater torsional forces and is less prone to flexing under load. This is particularly beneficial for 29-inch wheels, where lateral stiffness can be a concern. Boost spacing also provides additional clearance, which facilitates the use of wider tires and larger chainrings without affecting the chain line or q-factor of the bike. Regular Axles: Regular axles, including the standard quick-release and the traditional 100mm front and 135/142mm rear through-axles, have been the mainstay in mountain biking for many years. They offer simplicity and compatibility with a vast array of frames and forks. While they provide adequate performance for many riders, they lack the increased stiffness and strength found in Boosted axles. New Through Axles: The newer through-axle systems have largely replaced quick-release axles in performance-oriented mountain bikes. A through-axle slides through the wheel hub and screws directly into the frame or fork. This design significantly enhances the wheel/frame interface's stiffness and stability, leading to improved bike handling, especially in corners and rough terrain. It also ensures better alignment of disc brakes, reducing the chances of rotor rub. While through-axles add a marginal amount of weight, the trade-off in improved performance and safety is often worth it.