This size is most often found as a rear fitment on high-power, rear-driven performance cars and special editions, including examples like the Mercedes-AMG GT R and AMG GT Black Series. Fitments vary by year, trim and wheel package, so confirm the exact size on your door placard or in the handbook before ordering.
Most 325/30 R20 tyres are designed for wide rims, commonly around 11.0 to 12.0 inches, depending on the tyre model. Using a rim that is too narrow or too wide can affect handling, tyre wear and bead seating, so check the tyre manufacturer’s approved rim-width range before fitting.
Yes, replacing both tyres on the same axle is recommended to keep grip, braking and stability consistent, especially with a wide rear fitment. If the other tyre is still serviceable, matching the same brand, model and specification helps maintain balanced performance.
Start with the vehicle placard and handbook, then choose a 325/30 R20 tyre that meets or exceeds both the load index and speed rating specified by the manufacturer. Avoid mixing different ratings across the same axle, and if your car has an OE marked tyre requirement, select the correct marking where applicable.
Sometimes, but it depends on wheel width, arch clearance and the manufacturer’s approved sizes for your exact model. The extra width can alter clearance and may require a wider rim, and even small changes can affect traction control and speedometer accuracy. Check the approved fitment list for your car and confirm with a fitter before switching.
