Originally Posted by
mtnbk3000
if i want a half inch chain, can i use a regular single speed bmx cog or do i need one made specifically for a half inch chain
99.99% of chains are 1/2" chain.
The width of chains is usually either 3/32" or 1/8". BMX cogs are available in each width. If you're not sure what width your cog and chainring are, just get a 1/8" chain anc call it a day.