Surly Track Cog 1/8 X 15t Silver

Surly Track Cog 1/8 X 15t Silver is engineered for precise performance on track hubs. Featuring threading identical to BMX freewheels (1.375 x 24 tpi right-hand threads), this cog fits single-speed rear hubs and BMX freewheel hubs, though its optimal use remains on track hubs for reliable engagement and durability.

• Constructed from 415 hardened chromoly steel for long-lasting strength
• Thread size: 1.375" x 24 tpi, ensuring compatibility with track-specific threading
• Color and material shown in photo for reference only