What size cassette for SS R8000
Evening campers, I’m doing the Fred in a couple of weeks and have a compact 50/34 x 28 setup. Just wondering what sized cassette I can actually use with the SS rear mech. Shimano say 30, but i’ve Seen that for 6800 some people could use 32. Also, will I see a massive difference in pedalling by changing cassettes? 28 is fine for all my other riding, but thinking of making life a touch easier for myself.