GT Radial Champiro HPY 255/55 R18 109Y

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The GT Radial Champiro HPY is a high performance tire that offers excellent grip and handling in both dry and wet conditions. The unique tread pattern provides excellent traction and stability, while the reinforced sidewalls offer improved durability. This tire is also designed to provide a comfortable ride and reduced noise levels. This tire is designed to be used in high-performance driving conditions. It is made to provide excellent grip and handling on dry or wet roads.

What does 255/55R18 mean?


The tire width is 255mm.


The aspect ratio of the tire is 55. Aspect ratio is the relative height of tire sidewall. The number refers to the percentage of sidewall height in relation to tire width.


The letter in the middle refers to tire construction. Practically all tires sold for cars are radials.

Sometimes you also see tires with RF or ZR. RF indicates the tire is run flat, whereas ZR means the tire has speed rating higher than V. These tires are also radials, as the R indicates.


Rim diameter for the tire.

255/55R18 109Y tire size

The width of 255/55R18 109Y tire is stated in millimeters and sidewall height in percentages. In this table you’ll find out the 255/55R18 109Y tire size in inches as well as few additional metrics:

In inches In millimeters

Section Width

10.0″ 255mm

Sidewall height

5.5″ 140mm

Diameter / Height

29.0″ 738mm


91.2″ 2318mm

Rim Diameter



694 per mile 431 per kilometer

Rim Size for 255/55R18 109Y Tires

Recommended rim sizes for 255/55R18 109Y tire:

Diameter Width Range
18″ 7-9″

What does 109Y mean?

The load index 109 means that the tire has been designed to support 2271 lbs or 1030 kg.

The speed index Y means that the tire has been designed to be used in speed up to 186 mph or 300 kph.

This size tire is usually used for SUVs.

AboutGT Radial

GT Radial is a brand of tires that are known for their high performance and durability. The Champiro HPY is a model of tire that is specifically designed for high performance vehicles. It features a unique tread pattern that helps to provide grip and stability in all conditions. The tires are also made to be very durable, so they can withstand the rigors of high performance driving.

Tire Specification

Brand: GT Radial
Model: Champiro HPY
Season: Summer
Size: 255/55 R18
Load Index: 109 — 1030 kg | x4 - 4120 kg
Speed Index: Y — 300 km\h
Car Type:Passenger
Road: City
XL / Extra Load: No
RunFlat technology: No
Commercial / Reinforced: No