Regret I do not know about BMRs.
I have ran 225 60 15 on wide 5 5 1/2\" chromies on a 64 stock, and Arc is running them now.
I also ran 205 50 15 on 5 spoke Empi 5 1/2\" with a 1/4 or 3/8 spacers.
I have 175 70 15 on stock rims 4. 1/2\" currently.
Also Plan to run 195 60 15 or 195 65 15 on 5 1/2\" when I get my new motor.
basically it depends on your BMR's offset.
Hope that helps.
p/s look at the technical wheel sizing above on the right.