HPI Racing Savage XL 17mm Hex Hub Conversion Set Upgrade Parts for HPI Savage XLOverview Upgrade your HPI Savage XL with the HPI Racing 17mm Hex Hub Conversion Set. This kit converts the standard wheel hex hubs to a stronger 17mm format, decreasing stress on the wheels and helping prevent stripped wheels when using high horsepower engines or aggressive driving. 17mm hex hubs are the industry standard for high performance 1 8 scale RC, providing improved durability and access to a wider range of compatible aftermarket wheels. Key