Shimano Dura Ace NJS racing track bike cog 14T

This is the NJS approved, track racing fixed cog from Shimano Japan. It bears the Dura Ace name, and therefore represents the finest in Japanese production.
This is the 14T model.
16T is generally better for street use, 14 and 15 are very popular in pro keirin racing. 13T is to be used for the track with lighter chainring sizes, or with very small bmx front chainrings for trick/track bikes.
Shimano cogs are designed purely for pro track racing, so they never made anything above a 16T cog. Please check out the Grunge Tokyo, and B-Witch Tokyo cogs, if you are looking for something larger than a 16T.
Shimano Japan raised the price by 50% in July 2009.