I can't switch over the 3/32 cog off of my old wheel because it is just a BMX cog installed with a spacer kit and lockring on a freewheel hub. Do track cogs come in both 1/8 and 3/32 and if so which am I more likely to find at my LBS? If they only come in 1/8 then I guess I will just replace my chain and deal with the noise.