I'm sorry for acting dumb but I need some help/advice please. I've got a Giant Defy 2015 road bike that needs a cheap new 700c rear wheel for the turbo trainer. I'm confused about what kind of wheel/cassette I need? The bike has an 8-speed cassette (SRAM PG 850 11-32) plus Shimano Claris groupset but the wheels I've been looking at (Shimano RS100) have a Shimano hub. Should I get a Shimano cassette or another SRAM cassette assuming it will fit on a Shimano hub?