What does 255/70R18 mean?

In 255/70R18, 255 is the tread width in millimeters (about 10.0 inches). 70 is the aspect ratio: the sidewall height is 70% of the width, or about 179 mm (7.0 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 32.1 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 255/70R18, 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 255/70R18?

Often, yes, within limits. A common guideline is to keep the new tire’s overall diameter within about 3% of the original. For 255/70R18, which is about 32.1 inches tall, that means roughly 31.1 to 33.0 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 255/70R18 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.

255/70R18 Tires — Compare Prices from 2026 | TreadCompass

Find the right tires. Clearly.

Compare prices across retailers. No rankings based on commission.

Search by Tire Size

Width

Ratio

Rim

Staggered setup (different rear size)

Standard: 225/45R17 · Off-Road: 35/12.50R17

This page contains affiliate links. TreadCompass may earn a commission when you purchase through these links, at no extra cost to you. Learn more

All Tires(50)

255/70R18

Sort:

Shows only well-known tire manufacturers: Michelin, Bridgestone, Goodyear, Continental, Pirelli, Hankook, and 14 more established brands. Filters out lesser-known or budget brands.

Bridgestone DUELER H/T 684 II

255/70R18 112T

Sale

All Season

5.0(450)

50k mi

The Bridgestone Dueler H/T 684 II is a highway all-season tire for SUVs and light trucks, with an all-season tread, wide straight grooves and solid shoulder rib…Full details

$279.96

for 4 tires

$69.99 per tire

at eBay

eBay★ Best Price

In StockLoad 112Speed T

Save $692.04 vs next best

$279.96

for 4 tires

$69.99 per tire

255/70R18 Tires — Compare Prices

Find the right tires. Clearly.

All Tires(50)

Bridgestone DUELER H/T 684 II

Arisun Aresta ZG02

Westlake SU318

Dcenti DC66

Aplus Performax SUV/CUV

Entry Level Highway Terrain

Celimo Prevail H/T

American Roadstar H/T

Crossmax CHTS-1

Cosmo Road Hunter

Gladiator XComp H/T AS II

GT Radial Savero HT2

Evoluxx Capricorn 4X4 HP

Atlas Paraller 4x4 HP

GT Radial Adventuro HT

Achilles Desert Hawk HT3

Delinte DX-11

RoadX RXQuest HT HX01

Ironman RB-SUV

Armstrong Tru-Trac HT

255/70R18 Tires — Compare Prices

Find the right tires. Clearly.

All Tires(50)

Bridgestone DUELER H/T 684 II

Arisun Aresta ZG02

Westlake SU318

Dcenti DC66

Aplus Performax SUV/CUV

Entry Level Highway Terrain

Celimo Prevail H/T

American Roadstar H/T

Crossmax CHTS-1

Cosmo Road Hunter

Gladiator XComp H/T AS II

GT Radial Savero HT2

Evoluxx Capricorn 4X4 HP

Atlas Paraller 4x4 HP

GT Radial Adventuro HT

Achilles Desert Hawk HT3

Delinte DX-11

RoadX RXQuest HT HX01

Ironman RB-SUV

Armstrong Tru-Trac HT

255/70R18 tire FAQ

What does 255/70R18 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 255/70R18?

Why do prices for the same 255/70R18 tire vary across retailers?

Do the prices shown include installation or shipping?

Should I replace all four tires at once?