I wanted to replace the 16t stock freeeheel cog on my 700c single-speed with an 18t to get a lower gear ratio, and this cog did the trick. Note this is a two-prong cog, so you will need a two-prong tool to tighten/loosen if your current bike uses a four-prong tool.
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All-City Stainless Track Cog All-City's Stainless Track Cogs
are constructed of cromoly stainless steel which is CNC precision machined with a high polish finish. They are 1/8" width cogs, and threads are 1.37" x 24 tpi. In other words, for ...
The All City track cog is precision machined
from CroMoly steel. The All City cog has incredible quality at an affordable price. 1/8” width cogs Threads are 1.37” x 24 tpi 16T and lower are solid, while 17t and higher ...