Riken UHP 205/40 R17 84W

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The Riken UHP is a high performance tire that offers excellent grip and traction in all weather conditions. It is designed for use on sports cars and high performance vehicles. The tire has a unique tread pattern that provides excellent traction and handling. The tire is also very durable and offers a long lasting performance. The Riken UHP is a high-performance tire that is designed for use in a variety of conditions, including dry and wet weather.

What does 205/40R17 mean?


The tire width is 205mm.


The aspect ratio of the tire is 40. 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.

205/40R17 84W tire size

The width of 205/40R17 84W tire is stated in millimeters and sidewall height in percentages. In this table you’ll find out the 205/40R17 84W tire size in inches as well as few additional metrics:

In inches In millimeters

Section Width

8.1″ 205mm

Sidewall height

3.2″ 82mm

Diameter / Height

23.5″ 596mm


73.7″ 1872mm

Rim Diameter



860 per mile 534 per kilometer

Rim Size for 205/40R17 84W Tires

Recommended rim sizes for 205/40R17 84W tire:

Diameter Width Range
17″ 7-8″

What does 84W mean?

The load index 84 means that the tire has been designed to support 1102 lbs or 500 kg.

The speed index W means that the tire has been designed to be used in speed up to 168 mph or 270 kph.


Riken is a Japanese tire company that was founded in 1953. The company produces a wide range of tires for passenger vehicles, commercial vehicles, and racing cars. Riken is best known for its ultra-high performance (UHP) tires that are used on some of the world’s fastest cars. Riken UHP tires are designed to provide excellent grip and handling at high speeds.

Tire Specification

Brand: Riken
Model: UHP
Season: Summer
Size: 205/40 R17
Load Index: 84 — 500 kg | x4 - 2000 kg
Speed Index: W — 270 km\h
Car Type:Passenger
Road: City
XL / Extra Load: No
RunFlat technology: No
Commercial / Reinforced: No