It is commonly used as a rear tyre on high-performance SUVs with a staggered set-up, where the front tyres are narrower. Check your current sidewall markings and the vehicle placard to confirm the correct front and rear sizes before ordering. If you have an AWD system, keep sizes and rolling circumference matched to the manufacturer specification.
This size is typically paired with wider 21-inch rims, often around 10.5J to 11.5J depending on the tyre model. Always confirm the approved rim-width range in the tyre specification, as it can vary by manufacturer. Using the correct wheel width helps the tread sit properly and avoids clearance issues on the inner arch and suspension.
Many options come with higher load indices and XL (extra load) construction to suit heavier, more powerful SUVs, with speed ratings often in the W or Y range. Choose a load index and speed rating that meets or exceeds the figures on your vehicle placard or handbook. If your vehicle specifies an OEM-marked tyre, match that marking to maintain the intended handling and ride characteristics.
XL is very common in this size because the vehicles that use it often require extra load capacity. Runflat can be required on some models, especially if the car was supplied without a spare wheel. If you switch away from runflat, confirm your vehicle has a suitable puncture solution and expect a change in ride feel.
It is possible only if your vehicle manufacturer approves it, because the overall diameter and rolling circumference change noticeably. A lower profile like 315/35 R21 reduces sidewall height, which can affect speedometer accuracy, ground clearance, and AWD system tolerances. For the safest fit, stick to the sizes listed for your exact model and wheel option.
