Sumitomo

HTR Z5

Name: Sumitomo HTR Z5 275/35ZR18 XL
Brand: Sumitomo
SKU: HTR84
Price: 149.24 USD
Availability: InStock

275/35ZR18 XL

$149.24/tire $198.99

Set of 4: $596.96

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Specifications

Size	275/35ZR18 XL HTR Z5
Width	275 mm
Aspect ratio	35
Rim diameter	R18
Load index	99
Speed rating	Y
Load range	XL

UTQG	320 AA A
Tread depth	10/32"
Weight	27.6 lbs
Max pressure	50 psi
Severe snow (3PMSF)	No
Run-flat	No

About the Sumitomo HTR Z5

Summer Ultra High Performance Passenger Car tire.

Features

* Advanced tread compound* Wide circumferential grooves* Optimized tread rigidity* More than 50 sizes, from 17”- 20”, in Y speed ratings* Free Defect Replacement for Life of Usable Tread

Benefits

* Enables quick and powerful wet braking* Enhance wet road traction and boost hydroplaning resistance* Provides predictable high-speed stability* Excellent segment coverage

Understanding the 275/35ZR18 XL size

In the size code 275/35R18, 275 is the section width in millimetres (about 10.8"). 35 is the aspect ratio — the sidewall height is 35% of the width, or roughly 96.3 mm. R18 means radial construction on a 18-inch wheel, giving an approximate overall diameter of 25.6".

The load index 99 means each tire supports up to 1,709 lbs — about 6,836 lbs across a full set of four. The speed symbol Y certifies the tire to 186 mph under its rated load. Always match or exceed the load index and speed rating listed on your vehicle's door-jamb placard.

Tread life and grip ratings

This tire carries a UTQG rating of 320 AA A. The treadwear grade of 320 is a relative durability score — a grade of 200 is expected to last roughly twice as long as a grade of 100 under the same controlled test. Traction grade AA measures straight-line wet stopping grip (AA is highest, then A, B and C). Temperature grade A reflects heat resistance at sustained speed (A is highest).

Price and value

At $149.24 per tire, a full set of four costs $596.96. That is about 30% below the average price of the 47 tires we stock in this size.

Frequently asked questions

What does the tire size 275/35R18 mean?

275 is the section width in millimetres, 35 is the aspect ratio (sidewall height as a percentage of width, about 96.3 mm), and R18 indicates radial construction for a 18-inch wheel. Overall diameter is approximately 25.6 inches.

What are the load and speed ratings of the Sumitomo HTR Z5 275/35ZR18 XL?

Its load index of 99 allows up to 1,709 lbs per tire. Its speed rating of Y is certified to 186 mph. Check your door-jamb placard and do not fit a tire rated below the vehicle's requirement.

How much does a set of 4 Sumitomo HTR Z5 275/35ZR18 XL tires cost?

A single tire is $149.24 and a set of four is $596.96.

Does the HTR Z5 come in other sizes?

Yes — we stock 53 additional HTR Z5 sizes besides 275/35ZR18 XL. Fit only a size approved for your vehicle.