315/30R21 tires
Prices, best picks and current deals for 315/30R21, a common size on performance cars. It fits the Bentley Continental GT and more.
Yes, this fits your Bentley Continental GT. 315/30R21 is the original size on the rear axle on the 2019-2024 Bentley Continental GT.
The sticker inside the driver's door is still the final word, because trim and wheel package can change the size. Back to every Bentley Continental GT size.
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.
Toyo Proxes Sport 2
The value sweet spot: long mileage warranty, solid wet grip, sane price.
Listed as Toyo Proxes Sport 2 315/30R21 105(Y) Performance Passenger Tires
Pirelli Cinturato P7 All Season
The strongest wet and snow braking and the longest tread life among what is stocked in this size. Worth it if you keep the car.
Listed as Pirelli Cinturato P7 315/30R21 105V All Season Passenger Tires
Prices are per tire, before mounting and balancing. A set of four in the mid range comes to roughly $2,512 to $2,791, and a brand rebate can take another $50 to $110 off, see this month's deals.
Cheapest 315/30R21 right now
Gripmax SureGrip Pro 315/30ZR21 105Y Sport UHP Summer Passenger Tires
$172.96per tire $345.92 for 2 tires (one axle)
19 tires in this size, priced straight from SimpleTire's own product feed, read 13 November 2026. Stock and prices move daily, so check the shop for today's figure.
See every 315/30R21 tire in stock at SimpleTire
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.
What the numbers on the sidewall mean
A 315/30R21 tire is 315 millimeters wide, its sidewall is 30 percent of that (about 3.7 inches tall), and it mounts on a 21-inch wheel. That works out to an overall diameter of roughly 28.4 inches. Every replacement has to match all three numbers, and the load index and speed rating on the placard inside the driver's door have to be met or exceeded.
In this size our picks are marked 105V on the Pirelli Cinturato P7 All Season (2,039 lb per tire, rated to 149 mph). The first number is the load index, the letter the speed rating; a tire with equal or higher values than your placard is fine, a lower one is not.
Our guide on reading a tire size walks through the markings, and this one lists every load index and speed code.
Our three picks, side by side
One tire at each price level from what the retailer stocks in this size, with the mileage warranty and UTQG grades as published by the manufacturers and their retailers. Treadwear is the number to compare: it is a relative wear rate, so 700 should last roughly twice as long as 350 on the same car.
| Pirelli P Zero | Toyo Proxes Sport 2 | Pirelli Cinturato P7 All Season | |
|---|---|---|---|
| Price per tire (Nov 13, 2026) | not stocked today | $421.76 | $650.16 |
| Set of four | — | $1,687.04 | $2,600.64 |
| Service description in 315/30R21 | — | — | 105V |
| Mileage warranty | see listing | see listing | see listing |
| UTQG treadwear / traction / temperature | see listing | see listing | see listing |
| Season | see listing | see listing | All-season grand touring |
| Extras | — | — | — |
What 315/30R21 tires cost across the whole range
Of the 20 tires listed in this size, 19 are in stock today. The median is $682.87; a third of the tires cost $627.99 or less, and the top five percent start above $811.64. Those are per-tire prices before mounting and balancing, which adds $15 to $45 per tire at most shops, read from the retailer's feed Nov 13, 2026.
The same tires in neighboring sizes
The Toyo Proxes Sport 2, our mid-range pick here at $421.76, is also stocked in 265/45R21 ($331.46), 285/35R20 ($411.16), 295/30R20 ($383) and 295/35R20 ($435.84). Useful if your vehicle came with a different wheel package, or if you are comparing an upsize: the same tire usually costs more per inch of wheel, not per inch of rubber. Prices per tire, from the retailer's feed Nov 13, 2026.
Winter and this size: summer tires are not winter tires
Many tires sold in this size are summer tires, and the manufacturers advise against driving them in near-freezing temperatures: the compound hardens, grip drops sharply and the tread can crack. They also carry no M+S or 3PMSF marking, so a car on summer tires fails Colorado's Passenger Vehicle Traction Law outright on the 126 miles of I-70 between Dotsero and Morrison, in force from September 1 to May 31, unless it is all-wheel drive with at least 3/16 inch of tread; fines start at $130. If the car is driven year-round in a state with real winters, either run an all-season or all-weather tire in this size or keep a second set of winter tires, often on a smaller, narrower wheel that is also less expensive.
Vehicles that use 315/30R21
- Bentley Continental GT (2019-2024, 21 in rear)
Other years and wheel packages of the same models came on 275/40R20 or 275/35R21 instead, so read the placard inside the driver's door before you order.
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 $173–$628 per tire for a budget brand, $628–$698 for a mid-range tire like the Toyo Proxes Sport 2, and $698–$812 for a premium tire like the Pirelli Cinturato P7 All Season. A set of four therefore starts at about $692. 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), 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 Toyo Proxes Sport 2, 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 Pirelli Cinturato P7 All Season 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.