I would like to run 18x10 +42 with 285/30s on all four corners. How much pulling and rolling will be necessary? It is my understanding that +48 will work with stock fenders. So my question is how hard will it be to find those extra 6mm?

 

I don't think it will work up front with just rolling. I think you'd need some "massaging".

 

Up front I think you need to run +50mm on an 18x10 or 18x10.5" rim to clear like rynberg said.

99% of the people here that run 285/30/18's have 18x10 +50mm rims all around. That way you can rotate them for even wear front/back.

 

I set my rear rim on the front one just to see how ity would look (it's an 18x10 +42), and I don't think you'll like the result. Admittedly, there's a 275/35/18 on it, not a 285/30/18, but still.

 

why not pick up a set of wide front fenders?