Park Tool SW-16 Spoke Wrench

The SW-16 is a specialized wrench built specifically for adjusting internal spoke nipples. Because these nipples are recessed inside the rim, standard spoke wrenches cannot reach them, making this tool essential for truing wheels that use internal nipple systems.

The SW-16 is sized for 3.2mm internal nipples. Before purchasing, verify the nipple size on your specific wheelset, as internal nipples can vary in diameter depending on the manufacturer and rim type.

No, this tool will not work on standard external nipples. Its design is intended solely for the unique interface of internal nipples, where the wrench must fit into the rim bed to engage the nipple.

It is suitable for both. Park Tool designs their equipment to withstand the high-volume, daily use of professional bike shops, so it is more than durable enough for the occasional maintenance tasks of a home mechanic.

Yes. Because it provides a precise, secure interface with the nipple, it significantly reduces the risk of rounding out the nipple heads compared to using improvised or ill-fitting tools.