Went to replace my chain and my 8 speed cassette was pretty much spent. Went to lbs and they had Sun Race for £15, some Shimano ones for £16, and then there was a massive leap to £40 plus for shimano.. because 3 of the sprockets were aluminium alloy. I bought the Sun Race one. I'm overweight, what difference is a few grams gonna make? I don't race, I commute and hack some singletrack. Have I done the right thing here or is there something I am missing?