This weekend the OE fit Michelin Pilot Sport SCs were replaced by a pair of Pirelli Diablos – more on that story later. While at Essential Rubber in Hackney, the guys there noticed that the rear sprocket was not tight against the carrier. This answers my question from an earlier post, here was the true cause of the noise that I had incorrectly diagnosed as a chain noise (at least I could tell it was final drive related).
The risk in these circumstances is that the holes in the sprocket will elongate as well as wearing the bolts themselves – to the point that they will eventually snap. Further investigation and comparison with a new sprocket revealed that the holes had not elongated and that the bolts were not damaged. A quick application of a spanner to the bolts has completely cured the noise.
I’ll be keeping an eye on that one !
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