The Park Tool SW-18 Internal Nipple Spoke Wrench is a precision tool designed specifically for wheels that use internal spoke nipples with a 5.5mm interface. Common on many modern aero road, gravel, and mountain bike wheels, internal nipples require a dedicated tool to ensure accurate adjustment without damaging the nipple or rim. The SW-18 provides that exact fit and control.

Machined to tight tolerances, the 5.5mm hex profile engages internal nipples securely, allowing for precise spoke tension adjustments during wheel building or truing. A proper fit is critical when working with internal nipples, as access is limited and rounding a nipple can turn a routine adjustment into a costly repair. The SW-18 minimizes that risk by delivering consistent engagement and reliable torque transfer.

The wrench features a compact, ergonomic handle that offers excellent control while working inside deep-section rims. Its size and balance make it easy to manage fine adjustments, helping mechanics achieve even spoke tension and proper wheel alignment. Whether you’re correcting minor deviations or performing a full wheel build, the tool supports accurate, repeatable results.... Read More