Driven by the Fashion Statement Crowd...Laughable when they first
came out
Larger dia brake disc does have a longer moment, but centrifugal
forces becomes an issue. Think larger fly wheel needing more braking
to slow/stop...even though longer moment (lever arm)
Other issues crop up with larger dia disc made of cast iron and
is the fly apart speed is approached and dependent on the tires
revs per mile or dia.
The big one for the Fashion Statement Crowd is reduced 'ride quality'
with the higher weight of larger dia wheels and brake discs
As for the load rating of both the wheel and tire...in the early
stages of transition to larger dia had limited sources and options
At very high prices
Now the choices and prices have come down a bit
With the masses going towards this type of 'look', choices and
ratings are coming up there.
Personally, I like 16's and the look it has on a TRUCK...