Nashbar 7/8 speed KMC Recumbent Chain (KMC Narrow Z-40)
I got this chain for my 3/32" fixed gear bike, thinking I could essentially get 2 chains for $8. Well, my rear cog makes loud "clacking" sounds with the rotation of the wheel. I just got a new crankset/chainring combo today too (Sugino RD) and now it's making some sort of metal scratching/sandy sound.
Does anyone know whether this is the chain's fault? I took a closer look at the chain today and it says "KMC Narrow Z-40". Narrow?? I hope this isn't more narrow than normal chains and is causing more wear. Upon inspection of my EAI cog (brand new), it has worn off the brown plating on every other tooth so that bare metal is exposed. Is this normal?