The clinking-clanking noise was becoming more and more apparent in the climbs. So in my renown empirical-enquire-mood I started a methodical search for the origins of the misterious noise.
The trial and error went as follows:
a) First hypothesis: "under a high load the torsional deformation of the chainstays squeezed the metal fender". I squeezed the fenders far beyond the reach of a "torsioned" chainstay and... nothing changed.
b) all right, then... "it must be a crack in the bottom bracket shell" (again?) Well, in fact, there seems to be a scratch there in top of the lug but no; after some frame flex test... no, I'm quite sure of that.
c) 2So it's the pedal". I should have ben more methodical. See how it spins... smoooothly! Then...
d) the bottom bracket, perhaps? Well, I've got some eight thousand miles out of it. Yes, could be... but after removing the cranks it seems to run smoothly enough though.
By then I was starting to consider panicking as an option till I reconsidered the chain. Yes, it's a bit old but it's been properly maintained and I mesured it not long ago and found that the wearing-out was negligible. I oiled it (over-oiled, in fact) and the misterious noise slowly faded away...
So that's it: I need a new chain.
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