Wheel/tire fitment questions

I am looking to purchase a set of 31×10.50r15 BF Goodrich KM2’s or 32×11.50r15 KM2’s and want to make sure both sizes will fit. I will also be getting the MSA m21 LOK 15×7 beadlock wheels. If anyone has this setup or knows if they will fit please let me know. Also what clutch kit would be recommend for these tire sizes. I have a few that I have been looking at, but still undecided since I am new to the rzr world. I know the tires are heavier, but is anyone unhappy with the performance after going with larger tirse? We do a lot of fast pace trail riding and don’t want rob a lot of power.

Thanks!