Sturmey Archer 3-speed flat cog, 3-spline, 1/8" - 20t chrome

3-spline steel cogs for use with Sturmey 3-speed (and 5sp) internal gear rear hubs
Flat or dished for tuning chainline. Xylan coating for greater durability
size: flat 1/8"
teeth: 20t
finish: chrome