I have decided to go with the Mondera B52. My question is what size should I go with 18" or 20" does one have an advantage over the other or does one size look better then the other kinda confused on this cause all i have seen for this wheel is the 20" on the explorer plus the 20" is more ????? is it really worth the???? over the 18". Tell me your opinions. Oh also I know the tire size for the 20 is 275/45/20 what is it for the 18 Thanks