315/30R21 tires
Prices, best picks and current deals for 315/30R21, a performance cars size fitted to Bentley Continental GT, Bentley Flying Spur and more.
What 315/30R21 tires cost
Pirelli P Zero
Lowest price that still brakes and wears acceptably. Fine for a second car or low annual mileage.
Continental SportContact 6
The value sweet spot: long mileage warranty, solid wet grip, sane price.
Michelin Pilot Sport 4S
Best wet and snow braking, quietest ride, longest tread life. Worth it if you keep the car.
Prices are per tire, before mounting and balancing, based on what the big US online retailers charge for this size. A set of four in the mid range comes to roughly $1,620 to $2,000, and a brand rebate can take another $50 to $110 off, see this month's deals.
About the 315/30R21 size
Bentley rear size on 21 in wheels, matched to 275/35R21 fronts. Heavy cars, so use only versions with the right load index and keep the Bentley marking if the car is standard.
The numbers mean: 315 mm section width, sidewall height 30 % of that width, and a 21-inch rim. Overall diameter works out to about 28.4 inches. Any replacement has to match all three, and the load index and speed rating on your door sticker must be met or exceeded. Our guide on reading a tire size walks through it.
Vehicles that use 315/30R21
- Bentley Continental GT (2019-2024, 21 in rear)
- Bentley Flying Spur (2020-2024, 21 in rear)
Confirm on the door-jamb sticker before ordering. Optional wheel packages often change the size within the same model.
Which type of 315/30R21 tire?
All-Season Tires
Drivers in the South, West Coast and mild parts of the Midwest who want one set of tires that lasts a long time and is quiet.
Summer Tires
Sports-car and performance-sedan owners, and anyone in a warm climate who wants the best possible grip and steering.
Performance Tires
Owners of sports sedans, hot hatches and performance crossovers who want year-round tires with real handling.
Frequently asked questions
How much do 315/30R21 tires cost?
Expect $320–$395 per tire for a budget brand, $405–$500 for a mid-range tire like the Continental SportContact 6, and $510–$660 for a premium tire like the Michelin Pilot Sport 4S. Add roughly $15 to $45 per tire for mounting and balancing.
What vehicles use 315/30R21 tires?
315/30R21 is original equipment on Bentley Continental GT (2019-2024, 21 in rear) and Bentley Flying Spur (2020-2024, 21 in rear), among others. Always confirm with the sticker inside your driver's door, because trim levels and wheel packages can change the size.
What is the best 315/30R21 tire?
For most drivers our mid-range pick, the Continental SportContact 6, is the sweet spot of price and tread life. If you keep the vehicle a long time or drive in heavy rain and snow, the Michelin Pilot Sport 4S is worth the extra. On a tight budget the Pirelli P Zero is a sound choice.
Can I replace just one or two 315/30R21 tires?
On a front- or rear-wheel-drive car, yes: replace in pairs on the same axle and put the newer pair on the rear. On all-wheel-drive vehicles most makers want all four replaced together, or a new tire shaved to match, because a difference in circumference strains the drivetrain.