Riken UHP 235/45 R18 98W

Check Price

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 235/45R18 mean?


The tire width is 235mm.


The aspect ratio of the tire is 45. 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.

235/45R18 98W tire size

The width of 235/45R18 98W tire is stated in millimeters and sidewall height in percentages. In this table you’ll find out the 235/45R18 98W tire size in inches as well as few additional metrics:

In inches In millimeters

Section Width

9.3″ 235mm

Sidewall height

4.2″ 106mm

Diameter / Height

26.3″ 669mm


82.7″ 2101mm

Rim Diameter



766 per mile 476 per kilometer

Rim Size for 235/45R18 98W Tires

Recommended rim sizes for 235/45R18 98W tire:

Diameter Width Range
18″ 7.5-9″

What does 98W mean?

The load index 98 means that the tire has been designed to support 1653 lbs or 750 kg.

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

This size tire is usually used on a high-performance car.


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: 235/45 R18
Load Index: 98 — 750 kg | x4 - 3000 kg
Speed Index: W — 270 km\h
Car Type:Passenger
Road: City
XL / Extra Load: No
RunFlat technology: No
Commercial / Reinforced: No