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@Mr_Bump
however the combined wear on a cassette if you're spreading that wear over say a 7,8 or 9 sprocket spread (when cycling in cities which are mainly flat) then it is economically cheaper. I mean you can buy a new 9 speed cassette for £15 from a retailer that'll last you circa 5-10k depending on how you ride/maintain stuff. Compare the cost of a single speed sprocket & the amount of wear you'll get & it isn't any cheaper.
regarding wear & tear on drop STIs for instance, I've had 10K plus on Dura Ace, the diff in price between a decent used set of those to say 105 is actually not that great (Circa 30-40% NOT multiple amounts) Derailleurs just last for years & years with the odd cable here and there.
Obviously SS is nice & simplistic and if you dont have too many stops/gradients I think it's the best way to get around but being able to get the most efficient cadence means exerting less energy & having the right ratio for the right situation.