The cycling world is witnessing an unexpected revival of the Super Boost axle standard. After a period where several prominent brands, including Evil, Salsa, and Devinci, phased out Super Boost in favor of the more widespread Boost 148, the 157mm standard is now regaining traction. This resurgence is primarily fueled by the burgeoning interest in larger 32-inch mountain bike wheels. Despite its initial struggle to gain widespread adoption, with only Pivot among major manufacturers consistently utilizing it for non-downhill bikes, the technical advantages of Super Boost, such as improved chainring clearance, tire clearance, and enhanced frame stiffness, are proving crucial for the evolving demands of bigger wheels. The introduction of modern drivetrains, which initially seemed to diminish the necessity for Super Boost by offering wider chainlines, now faces a new challenge from the unique requirements of these super-sized wheels.
The Unexpected Comeback: Super Boost and 32-inch Wheels Redefine Mountain Biking Standards
In 2025, the landscape of mountain bike axle standards appeared to be shifting away from Super Boost. Leading manufacturers like Evil, Salsa, and Devinci, who had previously incorporated the wider 157mm spacing, began transitioning their new models back to the more common Boost 148. This move was partly influenced by advancements in drivetrain technology, such as SRAM Eagle Transmission and Shimano Di2, which provided wider chainlines, mitigating some of the previous design challenges Super Boost aimed to address. Evil, for instance, explicitly stated their return to Boost 148 for their Offering trail bike, citing that modern drivetrains negated the need for the 56.5mm chainline previously offered by Super Boost.
However, the narrative has dramatically changed with the emergence and growing popularity of 32-inch mountain bike wheels. Boutique frame builders and enthusiasts are discovering that Super Boost offers critical benefits for these larger wheels, primarily in enhancing lateral wheel stiffness and overall frame integrity. Nick Wigston from Zinn Cycles, a pioneer in 32er frames, confirmed their exclusive use of Super Boost to achieve a wider spoke angle and a more robust wheel. Similarly, Singular founder Sam Alison highlighted the necessity of Super Boost for their Albatross 32er model, emphasizing its role in counteracting the potential for reduced lateral stiffness in larger hoops. This renewed demand has prompted component manufacturers to re-engage with the standard. Chris King Precision Components recently announced new 6-bolt options for their Super Boost hubs, responding to market demand from both existing downhill bikes and a potential future wave of 32er models. Industry Nine (I9) also introduced Hydra2 hubs with Super Boost spacing last year, available in both 6-bolt and Centerlock configurations, enabling custom wheel builds for the burgeoning 32er market. While Shimano’s recent XT and XTR wheelsets notably omitted Super Boost options, the commitment from other key players signals a significant shift. This re-evaluation of Super Boost underscores a broader trend in cycling where "old" standards, like the 157mm spacing originally used for downhill bikes, are repurposed and revitalized to meet new engineering challenges and rider preferences.
This fascinating resurgence of Super Boost, driven by the advent of 32-inch wheels, offers a compelling lesson in product evolution and market adaptability. It reminds us that in the dynamic world of cycling, no standard is ever truly obsolete; innovation often involves revisiting and re-contextualizing existing technologies. For consumers, this could mean more specialized and higher-performing bikes, albeit with the continued challenge of navigating a diverse and sometimes fragmented set of component standards. For manufacturers, it highlights the importance of anticipating evolving needs and remaining agile in product development. Ultimately, the cycle of innovation ensures that even seemingly outdated solutions can find new life when paired with groundbreaking advancements.