let me preface this with my intended setup:

Nismo suspension (20mm / 0.8" drop)
Axis Hiro 19"

now what I was wondering was could the rear 10.5" Hiros fit up front? I know the fenders would have to be rolled....but would that be the only thing needed? would the tires stick way out?

this is just a random thought to get some more rubber up front to reduce understeer and still have lots of grip

 

I'm sure with that kinda drop and that wide a wheel there would have to be some serious fender cutting or rolling, not positive though.

What would you put in the rear then? I dont see why anyone would want bigger than a 9.5 up front. The rear is where you want to make sure there is traction. If you were doing a show car or a widebody kit or something I could understand it.

"would the tires stick out?"
That would depend on the offset of the wheel i assume. There are people that are running a 275 tire on front 9in wheels and I dont think they stick out really. I believe that is on the 20x9 axis seven mods that some people have.

If thats what you want to do though, go for it.

 

You'll have clearance issues in the front. I don't think you can modify the front fender with rolling.