What is the biggest size tire will fit on a 15X7 rim?

The largest tire that typically fits on a 15x7 rim is usually around 225/70R15 or 235/60R15, depending on the vehicle's clearance and suspension setup. However, it's essential to consider the specific vehicle and its wheel well dimensions, as well as any potential modifications. Always consult with a tire professional to ensure proper fitment and safety.