Phil Wood track cogs are manufactured from solid stainless steel bars and tripple heat-treated, making them one of the strongest cogs available. 

We recommend Phil track cogs with because they're machined to work together seamlessly, but they also work on all 1.37" x 24 tpi English threaded hubs.

Only available in 1/8″ width.

Additional information:

• Fits: Standard fixed gear threads 1.37" x 24 tpi
• Chain Width: 1/8" only
• Tooth Count: 15 to 22 teeth
• Material: Hardened stainless steel polished to a mirror finish
• Made in the U.S.A.