Yes, it is commonly used as a rear size on staggered 20-inch setups because the extra width helps put power down. Always confirm the approved front and rear sizes on your door jamb sticker or in the handbook, then replace tyres in axle pairs to keep handling consistent.
Use the exact load index and speed rating listed by your vehicle manufacturer and never fit a lower rating. Many 315/30 R20 options are high speed rated and may be offered with reinforced constructions, but the correct choice depends on your car, wheel setup and intended use.
Sometimes, but it needs checks before you buy. The extra width can affect clearance to suspension and arches, and it may also change rolling circumference enough to matter on some cars. If you are unsure, compare the approved sizes for your model or ask for a fitment check using your current tyre markings and wheel width.
You will see XL (extra load) versions in this size, and runflat options may be available from selected brands. Choose XL only if it matches or exceeds the required load rating, and choose runflat only if your vehicle is designed for it or you have confirmed compatibility with your wheels and tyre pressure monitoring system.
This size typically suits wide rims, often around 11J, but the exact approved range depends on the tyre model. Check your wheel width stamp on the inside of the rim, then compare it with the tyre manufacturer’s rim width range to avoid stretched sidewalls or rubbing issues.
