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@cernan
Right oh desperation is driving me to what will undoubtedly be a fruitless posting that will result in scorn being poured on but here goes:
Of late a grinding/vibration has developed in my cranks. This appears to only occur as the non drive side crank passes the chain stay. It is present at slow speed and to a lesser degree a high speed. Chain line is visually fine and the grind appears chain tension independent (it lessens marginally with a looser chain possibly but it is probably my imagination.) I've had the BB (miche track, with miche chain ring) out and given it a clean off and a re greasing prior to re-installing but without any joy.
I haven't tried a different sprocket but have tried a different wheel with no effect. I have UTFS'd, which only suggested chain tension issues which I don't think i am having. The bottom bracket as been in place and in use since early december 2008. Could this simply be a case of worn out BB in need of replacement?
thinking about this a bit more i do have a near obbessional drive to get my chain tensioned very tight. I never get it where i want it so there is a little give in it. I'm not sure if there is really a 1/2" travel in it so would it be likely that over tightening is causing the problem?
Thanks