With bicycles you are the engine. With that being said, having a lighter bike will make it easier on you. Making your bike lighter can be very expensive, so some parts are more important than others. The general rule is that if it spins it’s important. Things like wheels, tires, cranksets, shoes and pedals are all good items to try to reduce weight. Think of a long ride, how many times do your pedals (or wheels) go around? A lot! So saving just a tiny bit of weight on these items will make every rotation easier on you. Which means you can ride faster and further with less effort and who doesn’t want that?