Threading dies are the heart of a spoke machine. For two years we offered a double sided design from TW but after delivering nearly 100 sets we have changed to a new source—a small, experienced, perfectionist maker in Japan. The newest dies are single sided and to a higher standard of finish. Double sided (the previous design) offer potentially longer service but tooling on both dies sides introduces variations that interfere with thread shape at the microscopic level. Our new dies are not cheaper but dialing them in is smoother. Threading action is also excellent as these have full form finish relief, meaning the fixed die entry ramps are fully tooled, a feature our previous die maker was unable to do.
When to replace
A die set is worn when its surface feels rough. Close examination shows material has fractured and broken away. The metal does not wear down smoothly—instead, it fatigues and crumbles. Even when wear is advanced, good threads can be made since the spoke rotates six times in the process so the die has many chances to form a correct thread.
Adjusting your machine to have moderate thread depth will help dies last longer. Rather than going to ISO/JIS spec (2.27mm thread OD on 14G) stay a bit below this (2.20mm). Oversized spokes (2.0+ wire diameter) come around and we don’t want your machine to be under excess pressure. That will wear dies.
Always best to use oil when threading and brush out the dies after a few runs. Any oil will do and rag or brush is effective. Use stuff that’s sustainable and smells good.
We now recommend that all bicycle spoke gauges be rolled with this primary die set: 15, 14, 13, 12G. Adjust the shimming of the dies as explained on page 8 of the Operation Manual, available to download here.