305/30R21 tires
Prices, best picks and current deals for 305/30R21, a common size on performance cars. It fits the Porsche Taycan, Porsche 911, Audi e-tron GT and more.
Yes, this fits your Porsche Taycan. 305/30R21 is the original size on the rear axle on the 2020-2024 Porsche Taycan.
The sticker inside the driver's door is still the final word, because trim and wheel package can change the size. Back to every Porsche Taycan size.
What 305/30R21 tires cost
Continental SportContact 6
Lowest price that still brakes and wears acceptably. Fine for a second car or low annual mileage.
Hankook iON evo IK01
The value sweet spot: long mileage warranty, solid wet grip, sane price.
Listed as Hankook iON evo IK01 305/30ZR21 104Y UHP Passenger Tires
Goodyear Eagle Touring
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 Goodyear Eagle Touring 305/30R21 104H All Season Passenger Tires
Prices are per tire, before mounting and balancing. A set of four in the mid range comes to roughly $1,799 to $2,218, and a brand rebate can take another $50 to $110 off, see this month's deals.
Cheapest 305/30R21 right now
Gladiator X COMP H/P 305/30ZR21 104Y Performance Passenger Tires
$167.96per tire $335.92 for 2 tires (one axle)
20 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 305/30R21 tire in stock at SimpleTire
About the 305/30R21 size
Shared by the 992 Carrera S and the Taycan/e-tron GT twins. On the EVs look for the low-rolling-resistance N-spec or EV version, otherwise range drops noticeably.
What the numbers on the sidewall mean
A 305/30R21 tire is 305 millimeters wide, its sidewall is 30 percent of that (about 3.6 inches tall), and it mounts on a 21-inch wheel. That works out to an overall diameter of roughly 28.2 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 104H on the Goodyear Eagle Touring (1,984 lb per tire, rated to 130 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.
What 305/30R21 tires cost across the whole range
Of the 25 tires listed in this size, 20 are in stock today. The median is $478.49; a third of the tires cost $449.87 or less, and the top five percent start above $711.27. 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 Goodyear Eagle Touring, our premium pick here at $492.99, is also stocked in 235/55R20 ($209.99) and 275/40R22 ($478.99). 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 305/30R21
- Porsche Taycan (2020-2024, 21 in rear)
- Porsche 911 (2020-2024, 992 Carrera S rear)
- Audi e-tron GT (2022-2024, 21 in rear)
Other years and wheel packages of the same models came on 245/35R20, 235/40R19 or 265/35R21 instead, so read the placard inside the driver's door before you order.
Which type of 305/30R21 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 305/30R21 tires cost?
Expect $168–$450 per tire for a budget brand, $450–$554 for a mid-range tire like the Hankook iON evo IK01, and $554–$711 for a premium tire like the Goodyear Eagle Touring. A set of four therefore starts at about $672. Add roughly $15 to $45 per tire for mounting and balancing.
What vehicles use 305/30R21 tires?
305/30R21 is original equipment on Porsche Taycan (2020-2024, 21 in rear), Porsche 911 (2020-2024, 992 Carrera S rear) and Audi e-tron GT (2022-2024, 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 305/30R21 tire?
For most drivers our mid-range pick, the Hankook iON evo IK01, 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 Goodyear Eagle Touring is worth the extra. On a tight budget the Continental SportContact 6 is a sound choice.
Can I replace just one or two 305/30R21 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.