I have 19" ROH Modenas on my Coupe and I have 245/35/19 in tires but I want more meat on the tires. I have 275/35/19 on my rear which is a little bit bigger than I had originally had. Can I go bigger on the front tires.

 

Not if you want to turn, you can always make your steering stops bigger, but you will loose a lot of steering capability from lock to lock.

 

imho 245/35/19 and 275/35/19 are perfect sizes for the coupes.