Roadking 315/40ZR21 — what it is (real-world meaning)
Roadking is a budget Chinese tyre brand often sold in large SUV sizes like 315/40ZR21, mainly for luxury SUVs and aftermarket 21-inch rims.
This exact size is typically used on:
Range Rover / Range Rover Sport
BMW X5 / X6 (M Sport wheels)
Mercedes GLE / GLS
Large custom SUVs