questions

Hey everyone i have a 12 speed sram system with a gx axs deralier and a nx cassette that has worn out recently and was condering what cassette I should go for when I want max durability. I am not willing to get rid of my gx axs deralier and I have a hg freehub body. The options I have seen are...

For Context, I'm a university automotive and transport design student who has been given a brief to design an E-BIKE. I have chosen to target the E Mountain Bike performance market, and I thought it best to ask people in the space what is most important. Design Aesthetics? Weight? Handling...