I'm surprised the 235/60/15's didn't rub before the swap, that's not a tire that fits on most cars with the stock rims. Usually a 225/60/15 is about as big a tire as you want to run with the stock 15" rims.
What is your rim size and backspace? Without that I'm just guessing.
What is your rim size and backspace? Without that I'm just guessing.