Accelera Iota ST68 255/40R21 Tires

Accelera Iota ST68 255/40R21 XL 102W is a high performance all-season tire priced from $190.99.

Accelera Iota ST68 255/40R21 XL 102W Tire Specs

255/40R21 is a Metric tire used as an original equipment on a variety of popular crossovers, passenger cars and sport utility vehicles. It also comes in a High-Load (HL255/40R21) variant

Let us decode each aspect of the tire size code to have a full understanding what this tire size means.

255 is a section width of the tire from one sidewall to the other. Tire tread width is typically a bit narrower than the section width. Section width of 255/40R21 tire is 255 millimeters.

40 represents the aspect ratio of a tire, which is a ratio of the tire's sidewall height to its width. For 255/40R21 tire, the sidewall height is 40% of its tread width.

R denotes that 255/40R21 tire has radial construction.

21 represents the wheel diameter in inches that the tire is designed to fit. 255/40R21 can be mounted on rims with 21 inches in diameter.

XL denotes the load range of a tire. XL stands for Extra Load. Tires with this designation are constructed to carry more weight than standard load tires of the same size. This is achieved by reinforcing the tire's construction, often through additional or stronger layers known as plies.

102 indicates the load index. A tire with a load index of 102 can support a maximum load of 1874 pounds or 850 kilograms per tire.

W indicates the speed rating. A tire with a speed rating of W is approved for speeds up to 168 miles per hour or 270 kilometers per hour under optimal conditions.

Maximum inflation for Accelera Iota ST68 255/40R21 tire is 51 psi.

Uniform Tire Quality Grading System (UTQG) rating for Accelera Iota ST68 255/40R21 tire is 400 A A.

Tire manufacturer part number (MPN) is 1200053794.