Track chains.
 

I just got a wheel set and it came with a track cog, and non of my 6 speed chains fit it. I guess theres a special chain, i hear people using BMX chains, i might look in to that.

thanks for letting us know

look on the cog and see if there's a 3/32 or 1/8 designation. That's the chain width you want.

Must be 1/8".

OK ill check it out.

Thanks