So I've searched and played around but still no luck in eliminating a rollercoaster-like clicking noise from my rear cog. Searching the forums I cant get an answer on why there would be a noise with a rather ideal chainline. Here's the deal- chainline is dead-on in my measurements (yes, with a ruler not my eyeballs), chain is tight but no tighter than 1/2-1/4" deflection, rear cog is new, chainring and chain are older. I have also tried with an older cog, worn with the older chainring and chain, to see if it makes a difference - no such luck. All else - pedals, chainring bolts, are well torqued and straight.

Is it just a given that there will be noise? It is metal on metal regardless of chainline, so there HAS to be noise right? Does white lightening suck? Will some Phil oil make the difference? Or does this call for a late-night feast and sacrafice to appease the rear cog gods?

cheers and thanks

c