255/55R18 tires
Prices, best picks and current deals for 255/55R18, a common size on SUVs. It fits the BMW X5, Volkswagen Touareg, Porsche Cayenne and more.
Yes, this fits your Porsche Cayenne. 255/55R18 is the original size on the 2003-2010 Porsche Cayenne.
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 Cayenne size.
What 255/55R18 tires cost
Atturo AZ850
Lowest price that still brakes and wears acceptably. Fine for a second car or low annual mileage.
Listed as Atturo AZ850 255/55R18 109Y UHP Passenger Tires
Nexen Roadian GTX
The value sweet spot: long mileage warranty, solid wet grip, sane price.
Listed as Nexen Roadian GTX 255/55R18 109V All Season Passenger Tires
Bridgestone Dueler H/L 400
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 Dueler H/L 400 255/55R18 109H All Season Passenger Tires
Prices are per tire, before mounting and balancing. A set of four in the mid range comes to roughly $524 to $952, and a brand rebate can take another $50 to $110 off, see this month's deals.
Cheapest 255/55R18 right now
Royal Black 255/55ZR18 109W Racing Trac Passenger Tires
$91.99per tire $183.98 for 2 tires · $367.96 for 4
162 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 255/55R18 tire in stock at SimpleTire
About the 255/55R18 size
European luxury SUV size, H/V with 109 load index (XL). Grand-touring and highway tires; run-flat needed on some BMW fitments.
What the numbers on the sidewall mean
A 255/55R18 tire is 255 millimeters wide, its sidewall is 55 percent of that (about 5.5 inches tall), and it mounts on a 18-inch wheel. That works out to an overall diameter of roughly 29 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 109Y on the Atturo AZ850 (2,271 lb per tire, rated to 186 mph), 109V on the Nexen Roadian GTX (2,271 lb per tire, rated to 149 mph) and 109H on the Bridgestone Dueler H/L 400 (2,271 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.
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.
| Atturo AZ850 | Nexen Roadian GTX | Bridgestone Dueler H/L 400 | |
|---|---|---|---|
| Price per tire (Nov 13, 2026) | $127.07 | $217 | $216.99 |
| Set of four | $508.28 | $868 | $867.96 |
| Service description in 255/55R18 | 109Y | 109V | 109H |
| Mileage warranty | no mileage warranty | 70,000 mi | see listing |
| UTQG treadwear / traction / temperature | 320 A A (typical, varies by size) | 680 A A (typical, varies by size) | see listing |
| Season | Ultra-high-performance all-season | All-season, low rolling resistance | see listing |
| Extras | — | Total Coverage Warranty with 2-year road hazard | — |
What 255/55R18 tires cost across the whole range
Of the 236 tires listed in this size, 162 are in stock today. The median is $176.98; a third of the tires cost $130.99 or less, and the top five percent start above $318.29. 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 Atturo AZ850, our budget pick here at $127.07, is also stocked in 245/55R19 ($131.96), 275/35R19 ($132.96), 275/40R17 ($288.99) and 275/40R19 ($134.96). The Nexen Roadian GTX, our mid-range pick here at $217, is also stocked in 245/60R18 ($202) and 255/60R18 ($238). 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 on an SUV in this size
Most SUVs in this size are all-wheel drive or four-wheel drive, which is enough to satisfy Colorado's Passenger Vehicle Traction Law on the 126 miles of I-70 between Dotsero and Morrison, in force from September 1 to May 31, as long as the tires have at least 3/16 inch of tread. A two-wheel-drive version must instead be on tires marked M+S, 3PMSF or rated all-weather by the manufacturer. Fines start at $130. Four driven wheels help you pull away, not stop: a heavy SUV on worn all-seasons needs much more road to brake on snow than the same vehicle on a tire with the 3PMSF symbol, so in the snow belt choose the tire, not just the drivetrain.
None of our picks in this size, the Atturo AZ850, carries the 3PMSF symbol; for that, look at the all-weather and winter tires.
Vehicles that use 255/55R18
- BMW X5 (2007-2013, base)
- Volkswagen Touareg (2004-2017, base)
- Porsche Cayenne (2003-2010, base)
- Mercedes-Benz ML-Class (2006-2011)
- Audi Q7 (2007-2015, base)
Other years and wheel packages of the same models came on 255/50R19, 255/55R19 or 275/45R20 instead, so read the placard inside the driver's door before you order.
Which type of 255/55R18 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.
All-Terrain Tires
Pickup, Jeep and SUV owners who tow, drive gravel or dirt roads, or need real traction in snow and mud.
Highway Truck & SUV Tires
Pickup and SUV owners who commute, haul the family or tow on pavement and want quiet, long tread life and good fuel economy.
Frequently asked questions
How much do 255/55R18 tires cost?
Expect $92–$131 per tire for a budget brand, $131–$238 for a mid-range tire like the Nexen Roadian GTX, and $238–$318 for a premium tire like the Bridgestone Dueler H/L 400. A set of four therefore starts at about $368. Add roughly $15 to $45 per tire for mounting and balancing.
What vehicles use 255/55R18 tires?
255/55R18 is original equipment on BMW X5 (2007-2013, base), Volkswagen Touareg (2004-2017, base), Porsche Cayenne (2003-2010, base), Mercedes-Benz ML-Class (2006-2011) and Audi Q7 (2007-2015, base), 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 255/55R18 tire?
For most drivers our mid-range pick, the Nexen Roadian GTX, 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 Dueler H/L 400 is worth the extra. On a tight budget the Atturo AZ850 is a sound choice.
Can I replace just one or two 255/55R18 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.