You've got to have the right ratio for the track, and Shimano's Dura-Ace cogs come in a range of tooth counts so you can always be prepared. Manufactured from durable chromoly steel, each cog is machined to run perfectly straight.
1.37" x 24 tpi
|13T / 1/8-inch||689228170094||Y27913100|
|14T / 1/8-inch||689228170117||Y27914100|
|15T / 1/8-inch||689228170131||Y27915100||07565|
|15T / 3/32-inch||689228170124||Y27915000|