Accelera Iota ST68 325/30 R21 108Y

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The Accelera Iota ST68 is an all-season tire designed for high performance vehicles. The tire has an asymmetric tread design with a wide tread width and a narrow tread depth. The tire also has a reinforced sidewall and a high-density tread compound. The Accelera Iota ST68 provides excellent grip and handling on dry and wet roads. The tire also has a good resistance to tread wear. This tire is designed to be used in dry, wet, and winter conditions.

What does 325/30R21 mean?


The tire width is 325mm.


The aspect ratio of the tire is 30. 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.

325/30R21 108Y tire size

The width of 325/30R21 108Y tire is stated in millimeters and sidewall height in percentages. In this table you’ll find out the 325/30R21 108Y tire size in inches as well as few additional metrics:

In inches In millimeters

Section Width

12.8″ 325mm

Sidewall height

3.8″ 98mm

Diameter / Height

28.7″ 728mm


90.1″ 2288mm

Rim Diameter



703 per mile 437 per kilometer

Rim Size for 325/30R21 108Y Tires

Recommended rim sizes for 325/30R21 108Y tire:

Diameter Width Range
21″ 11-12″

What does 108Y mean?

The load index 108 means that the tire has been designed to support 2205 lbs or 1000 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 on high-performance vehicles.


Accelera Iota ST68 is an all-season tire that provides excellent traction and handling in both dry and wet conditions. The tire features a symmetric tread design with wide circumferential grooves that help evacuate water to reduce the risk of hydroplaning. The Iota ST68 also has a reinforced sidewall that provides increased durability and resistance to punctures.

Tire Specification

Brand: Accelera
Model: Iota ST68
Season: Summer
Size: 325/30 R21
Load Index: 108 — 1000 kg | x4 - 4000 kg
Speed Index: Y — 300 km\h
Car Type:SUV
Road: On/Off road
XL / Extra Load: No
RunFlat technology: No
Commercial / Reinforced: No