Surly Track Cog 1/8'' X 19t Silver MFPN=8030819354430 Durability was crucial

Durability was crucial

5" ISO Width (mm) 50 Labeled Size 27

Body mapped mesh for optimal temperature regulation

Stroke (mm) 55 Lockout Switch Shock Mounted Switch Metric Yes Eyelet Diameter (mm) Trunnion

Flat Protection TreadTPI 60Color BrownWeight 680Defined Color BrownISO Width (mm) 55ISO Diameter 622 / Road / 29"Tire Intended Use MountainTire Diameter 29"Tire Bead FoldingLabeled Size 29 x 2

Surly Track Cog 1/8'' X 19t Silver MFPN=8030819354430 Durability was crucialSurly track cogs are threaded the same as a BMX freewheel (1. 375 x 24 tpi right hand threads). This means that they will fit on single speed rear hubs as well as BMX freewheel hubs but this application is not recommended. Track cogs are meant to work on track hubs only. 415 hardened chromoly steel 1. 375" x 24 tpi Photo for color and material reference only Tooth Count 19 Size 1 8''