255/40R18 tires
Prices, best picks and current deals for 255/40R18, a common size on performance cars. It fits the Genesis G70, BMW 3 Series, BMW M340i and more.
Yes, this fits your Genesis G70. 255/40R18 is the original size on the rear axle on the 2019-2024 Genesis G70.
The sticker inside the driver's door is still the final word, because trim and wheel package can change the size. Back to every Genesis G70 size.
What 255/40R18 tires cost
Lexani LX-Twenty
Lowest price that still brakes and wears acceptably. Fine for a second car or low annual mileage.
Listed as Lexani LX-Twenty 255/40R18 99W Performance Passenger Tires
Yokohama Advan
The value sweet spot: long mileage warranty, solid wet grip, sane price.
Listed as Yokohama Advan Sport V107 255/40ZR18 99(Y) UHP Passenger Tires
Bridgestone Potenza RE980AS
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 Bridgestone Potenza RE980AS 255/40R18 99W UHP Passenger Tires
Prices are per tire, before mounting and balancing. A set of four in the mid range comes to roughly $556 to $904, and a brand rebate can take another $50 to $110 off, see this month's deals.
Cheapest 255/40R18 right now
Aplus Pro 255/40ZR18 99W Racing Passenger Tires
$82.96per tire $165.92 for 2 tires (one axle)
75 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 255/40R18 tire in stock at SimpleTire
About the 255/40R18 size
Rear half of a staggered 18 in sport-sedan setup (fronts are 225/45R18). Y-rated, and you cannot rotate front to rear.
What the numbers on the sidewall mean
A 255/40R18 tire is 255 millimeters wide, its sidewall is 40 percent of that (about 4.0 inches tall), and it mounts on a 18-inch wheel. That works out to an overall diameter of roughly 26 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 99W on the Lexani LX-Twenty and Bridgestone Potenza RE980AS (1,709 lb per tire, rated to 168 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.
| Lexani LX-Twenty | Yokohama Advan | Bridgestone Potenza RE980AS | |
|---|---|---|---|
| Price per tire (Nov 13, 2026) | $109.96 | $215.07 | $223.99 |
| Set of four | $439.84 | $860.28 | $895.96 |
| Service description in 255/40R18 | 99W | — | 99W |
| Mileage warranty | 45,000 mi per the retailer's FAQ; its feature list says 55,000 mi | see listing | see listing |
| UTQG treadwear / traction / temperature | 320 A A (typical, varies by size) | see listing | see listing |
| Season | Ultra-high-performance all-season | see listing | see listing |
| Extras | — | — | — |
What 255/40R18 tires cost across the whole range
Of the 115 tires listed in this size, 75 are in stock today. The median is $202.96; a third of the tires cost $138.99 or less, and the top five percent start above $368.99. 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 Lexani LX-Twenty, our budget pick here at $109.96, is also stocked in 225/40R19 ($96.96), 225/35R19 ($96.96), 255/45R19 ($126.96) and 285/30R19 ($125.96). The Yokohama Advan, our mid-range pick here at $215.07, is also stocked in 285/35R19 ($248.96), 285/45R20 ($1,655.96), 265/35R21 ($327.99) and 275/45R21 ($339.96). The Bridgestone Potenza RE980AS, our premium pick here at $223.99, is also stocked in 205/45R17 ($180.99), 245/35R19 ($245.99), 275/35R19 ($271.99) and 285/30R19 ($306.99). 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.
None of our picks in this size, the Lexani LX-Twenty, carries the 3PMSF symbol; for that, look at the all-weather and winter tires.
Vehicles that use 255/40R18
- Genesis G70 (2019-2024, 2.0T rear)
- BMW 3 Series (2019-2024, 18 in staggered Sport Line / M Sport rear)
- BMW M340i (2020-2024, 18 in rear)
Other years and wheel packages of the same models came on 225/45R18, 225/40R19 or 255/35R19 instead, so read the placard inside the driver's door before you order.
Which type of 255/40R18 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 255/40R18 tires cost?
Expect $83–$139 per tire for a budget brand, $139–$226 for a mid-range tire like the Yokohama Advan, and $226–$369 for a premium tire like the Bridgestone Potenza RE980AS. A set of four therefore starts at about $332. Add roughly $15 to $45 per tire for mounting and balancing.
What vehicles use 255/40R18 tires?
255/40R18 is original equipment on Genesis G70 (2019-2024, 2.0T rear), BMW 3 Series (2019-2024, 18 in staggered Sport Line / M Sport rear) and BMW M340i (2020-2024, 18 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 255/40R18 tire?
For most drivers our mid-range pick, the Yokohama Advan, 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 Bridgestone Potenza RE980AS is worth the extra. On a tight budget the Lexani LX-Twenty is a sound choice.
Can I replace just one or two 255/40R18 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.