[fliprayzin240sx]

Get a plumb and see how much space you have between where the tire is and where the plumb line is at. Should give you an idea of how much space you have. If you have lets say...10mm space, then you can go 20mm wider tires. Look at a tire calculator online and get an idea of what size tires you can get while keeping the overall diameter the same.

Looking at your pix, is your fender rolled? If its not, you might wanna do that before you slap on some wider tires. I'd probably slap some 255s in there...