Two chain questions:
I have a Izumi super tough chain - 9 months use (4 hrs per week) - works fine but it is quite noisy - noisier than most other bikes, why?? Is it a chain issue or is it something else? Have tried adjusting the chain tension but seemingly makes no difference.
Secondly, how much chain tension is considered “ideal”? Obviously should not be too tight or too loose; 2-3 cm of slack up and down seems to be what most people go with - is this sensible??
Thanks