What does the size 225/40ZR18 mean?

Reading left to right: 225 is the section width in millimetres, 40 is the sidewall height as a percentage of that width, and the tire mounts on a 18-inch wheel. All three must match what your vehicle specifies.

How much weight can this tire carry?

Load index 92 means one tire is rated to carry up to 1,389 lbs at its recommended inflation pressure. Check the placard inside your driver’s door and never fit a lower index than it lists.

What does the W speed rating mean?

It certifies the tire for sustained speeds up to 168 mph under standard test conditions. Do not fit a rating below your vehicle’s original specification. Always drive within posted limits.

What is load range XL?

Load range is the tire’s strength class, carried over from the old ply-rating system. This tire is XL, which determines how much weight it carries at a given inflation pressure.

Is this tire suitable for year-round use?

It is a summer tire, optimised for warm dry and wet conditions. Summer compounds harden below roughly 45°F and are not suited to snow or ice.

Does this tire have run-flat capability?

No. This is a standard tire, so a spare or repair kit is needed if you lose pressure.

Authentic Tire

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Size225/40ZR18

Rim18"

Load RangeXL

Gladiator X Comp HP AS1 225/40ZR18

Name: Gladiator X Comp HP AS1 225/40ZR18
Brand: Gladiator
SKU: NAT-GLADIATOR-1801008402
Price: 75.25 USD
Availability: InStock

Price per tire

$75.25$83.99Save 10%

In stock

225/40ZR18 GLADIATOR X COMP HP AS1 92W XL 420 A-A 60K + ROAD HAZARD

Gladiator 225/40ZR18 Car & Sedan

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Brand newFactory-fresh

Your choiceDoor or installer

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Specifications

The full spec sheet

ModelThe manufacturer's name for this tread pattern. The same model in another size shares the same tread design and rubber compound.: X Comp HP AS1
Speed RatingA letter code for the highest sustained speed the tire is built to handle — T is 118 mph, H is 130, V is 149. Don't fit a rating lower than the one your vehicle came with.: W (Up to 168 mph)
Load IndexA code for the maximum weight one tire can carry at its recommended inflation pressure. Match or beat the index listed on your driver's-door sticker.: 92
Load RangeThe tire's strength class, carried over from the old ply-rating system. C, D and E carry progressively more weight at higher inflation pressures — you'll mostly see them on trucks and vans.: XL
SeasonThe conditions the tread and rubber compound are designed for. All-season is the year-round default; winter tires stay flexible below 45°F; summer tires grip best in warm, dry weather and aren't made for snow.: Summer
WeightWhat a single tire weighs. It doesn't change your price — delivery is quoted at checkout, not charged by weight.: 23 lbs
SidewallHow the lettering on the tire's outer wall is finished — blackwall, white letters, and so on. It's cosmetic and doesn't affect how the tire drives.: BW
Run FlatA reinforced sidewall that lets you keep driving a limited distance at reduced speed after losing air. Only fit these to a vehicle with tire-pressure monitoring.: No
UTQG: 420 A A
Tread warranty: 60,000 miles
WidthSection width in millimetres — the tire's width from sidewall to sidewall. It's the first number in a size like 225/65R17.: 225 mm
Aspect RatioThe sidewall height as a percentage of the section width — the second number in 225/65R17. A lower number means a shorter sidewall.: 40
Rim DiameterThe wheel diameter this tire mounts on, in inches. This one has to match your wheel exactly.: 18"
Part number: 1801008402

Performance

Why this tire

Tread and casing tuned for responsive steering and confident dry grip

Summer compound optimised for grip in warm dry and wet conditions

Extra Load (XL) construction carries more weight than a standard-load tire of the same size

Load index 92 — rated to carry up to 1,389 lbs per tire

Speed rating W, certified for sustained speeds up to 168 mph

225 mm section width, 40 series sidewall, mounts on a 18" wheel

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