What does 275/45R18 mean?

In 275/45R18, 275 is the tread width in millimeters (about 10.8 inches). 45 is the aspect ratio: the sidewall height is 45% of the width, or about 124 mm (4.9 inches). "R" means radial construction, which nearly all passenger and light truck tires use today. 18 is the wheel diameter in inches. Put together, the tire stands about 27.7 inches tall when new.

What do the load index and speed rating after the size mean?

The code after the size, such as 102H, tells you how much weight each tire can carry and how fast it is rated to go. The number is the load index (102 means 1,874 lbs per tire) and the letter is the speed rating (H means up to 130 mph). Your replacement tires should meet or exceed the load index and speed rating on the placard in your driver’s door jamb.

What is the difference between SL (Standard Load) and XL (Extra Load) tires?

An XL tire is built to carry more weight than an SL tire of the same size, and it reaches that higher capacity at a higher inflation pressure. Heavier crossovers, trucks, and many electric vehicles come with XL tires from the factory because of their weight. If your vehicle’s placard or original tires call for XL in 275/45R18, replace them with XL. Putting XL tires on a vehicle that only needs SL is fine, though the ride can be slightly firmer.

Can I use a different size instead of 275/45R18?

Often, yes, within limits. A common guideline is to keep the new tire’s overall diameter within about 3% of the original. For 275/45R18, which is about 27.7 inches tall, that means roughly 26.9 to 28.6 inches. A taller tire makes your speedometer read low: with a tire 3% larger, it shows about 58 mph when you’re actually going 60. Also check that the new size fits your wheel width, clears the suspension and fenders at full steering lock, and meets your vehicle’s load rating. When in doubt, ask a tire installer before switching.

Why do prices for the same 275/45R18 tire vary across retailers?

Each retailer sets its own prices and runs its own promotions. The total you pay also depends on shipping costs, installation and disposal fees, road hazard coverage, and manufacturer mail-in rebates, which can be worth $50 to $100 or more on a set of four. Stock and pricing can also vary by region. Compare the full cost at checkout, not only the tire price.

Do the prices shown include installation or shipping?

The prices we show are the per-tire prices listed by each retailer. Shipping, installation, taxes, and fees depend on the retailer and your location, and are shown at the retailer’s checkout.

Should I replace all four tires at once?

Replacing all four keeps handling and braking even. If you replace only two, most tire makers recommend putting the new pair on the rear axle to help prevent oversteer on wet roads. All-wheel-drive vehicles often need all four tires to have closely matched tread depth to protect the drivetrain, so check your owner’s manual before replacing only some.

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Bridgestone POTENZA SPORT

275/45R18 107Y

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UHP Summer

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With a 125-review aggregate at tire-reviews.com calling its wet grip the standout strength, and OE fitments on the Porsche 718 Cayman and Lamborghini Huracan co…Full details

$429.68

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$107.42 per tire

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In StockLoad 107Speed Y

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$429.68

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Bridgestone POTENZA SPORT

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Mickey Thompson ET Street

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275/45R18 Tires — Compare Prices

Find the right tires. Clearly.

All Tires(19)

Bridgestone POTENZA SPORT

Lexani LX-Twenty

Lionhart LH-Five

Continental ContiSportContact 5P

Dunlop SP Sport Maxx GT

Pirelli P ZERO

Pirelli Cinturato P7 Run Flat

Kumho Solus Majesty 9 TA91

Kumho Majesty 9 Solus TA91

Continental ContiSportContact 5

Bridgestone Potenza S007 A

Pirelli CINTURATO P7

Bridgestone POTENZA SPORT EVO

Goodyear Eagle F1 Asymmetric 2

Continental ContiProContact

Yokohama ADVAN Sport

Pirelli P Zero R

Mickey Thompson ET Street

Kumho WinterCraft WP72

275/45R18 tire FAQ

What does 275/45R18 mean?

What do the load index and speed rating after the size mean?

What is the difference between SL (Standard Load) and XL (Extra Load) tires?

Can I use a different size instead of 275/45R18?

Why do prices for the same 275/45R18 tire vary across retailers?

Do the prices shown include installation or shipping?

Should I replace all four tires at once?