As you already know the Galant is low riding car and on bad streets it can be a pain to drive on.

It would be nice to have some larger tires to raise it a little.

My question is what would be the largest size tires that could be used with 15 inch rims?

 

Im guessing the original tire size is a 195/65 15? Thats the biggest tire you want to get i mean those things are thick enough you could upgrade to a 205/65/15 but that just makes the tires a little bit wider and wouldnt solve a thing. If its riding bad you might wana check suspension