For sale one of my many track cogs, I'm retiring from track racing and this needs a new home. I had at least two sets of each gearing so they could be on my warm up and or spare wheels plus another complete set for fixed gear road bike. I just opened up my track gear bag and this is one of the cogs. A new SunTour 13 tooth track cog, it weighs 42 grams and is beautifully machined. I hope this finds someone's track equipment to add some more fun to their track experience. Enjoy and ride that bike!