315/25R19 Tire Size in Inches and Millimeters
315/25R19 tires have a diameter of 25.2" (641 mm), a tread width of 12.4" (315 mm), and a wheel diameter of 19" (482.6 mm).The sidewall of the tire is 3.1" (79 mm), and the tire's circumference is 79.1" (2012.7 mm). This means a 315/25R19 tire will make make 801 revolutions per mile, or 497 revolutions per kilometer.



Spec | Inches | Metric |
---|---|---|
Diameter | 25.2" | 641 mm |
Width | 12.4" | 315 mm |
Wheel | 19" | 482.6 mm |
Sidewall | 3.1" | 79 mm |
Circum | 79.1" | 2012.7 mm |
Revolutions | 801 per mile | 497 per km |
What Does 315/25R19 Mean?
The tire size 315/25R19 is a common size used on many trucks, SUVs, and other larger vehicles.
Here is what each part of the size designation represents:
- 315: This number represents the width of the tire in millimeters. In this case, the tire is 315 millimeters wide.
- 25: This number represents the aspect ratio of the tire, which is the height of the tire's sidewall as a percentage of its width. In this case, the sidewall height is 25% of the tire's width.
- R: This letter indicates the tire's construction type. “R” stands for radial construction, which is the most common type of tire construction today.
- 19: This number represents the diameter of the wheel that the tire is designed to fit on, in inches. In this case, the tire is designed to fit on a 19-inch wheel.

How To Convert 315/25R19 Into Inches
The 315/25R19 conversion is fairly simple. The first number in the tire size, 315, represents the width of the tire in millimeters. To convert this to inches, we divide 315 by 25.4 (since there are 25.4 millimeters in an inch). This gives us approximately 12.4 inches.
The second number in the tire size, 25, represents the aspect ratio or the height of the tire as a percentage of its width. To calculate the height in inches, we multiply 12.4 by 0.25, which gives us approximately 3.1 inches.
Finally, the last number in the tire size, 19, represents the diameter of the wheel rim in inches. Therefore, the tire size 315/25R19 can be expressed in inches as roughly 12.4 inches wide, 3.1 inches tall, and designed to fit a 19-inch wheel rim.
Frequently Asked Questions About 315/25R19 Tires
How tall is a 315/25R19 tire?
A 315/25R19 tire has an approximate height, also known as the overall diameter, of 25.2 inches (641 mm). This height can vary slightly depending on the brand and model of the tire, as well as the amount of air pressure in the tire.How wide is a 315/25R19 tire?
A 315/25R19 tire has a width of approximately 12.4 inches (315 millimeters). The width of the tire is the first number in the tire size designation, which in this case is “315”. It’s important to note that the actual width of the tire may vary slightly depending on the brand and model of the tire, and the width may also be affected by the amount of air pressure in the tire.Understanding Tire Speed Ratings
When choosing the right tires for your vehicle, understanding the speed rating is crucial. But what exactly is a speed rating, and why does it matter?What is a Tire Speed Rating?
A tire's speed rating indicates the maximum speed a tire can safely sustain over time. It's a manufacturer's assurance of tire performance, marked by a letter on the tire's sidewall. This rating is determined under controlled laboratory conditions and is part of a broader standard established by industry entities like the European Tyre and Rim Technical Organisation (ETRTO) and the U.S. Department of Transportation.Common Speed Ratings Explained
- P-Rated: Up to 94 mph - Suitable for smaller sedans or light-duty vehicles.
- Q-Rated: Up to 100 mph - Often found on SUVs and light trucks with consistent highway use.
- R-Rated: Up to 106 mph - Typically for medium-duty trucks and vans.
- S-Rated: Up to 112 mph - Common for family sedans and larger vehicles with moderate performance.
- T-Rated: Up to 118 mph - Optimal for family vehicles, including minivans and some coupes.
Why is the Speed Rating Important?
The speed rating is not just about how fast you can legally drive; it's about safety and performance:- Ensures Safety: It guarantees that the tire can handle certain speeds without overheating and failing, which can prevent blowouts.
- Optimizes Performance: Higher ratings often indicate better handling characteristics, important for maintaining vehicle stability.
- Legal and Insurance Considerations: Matching the speed rating suggested by your vehicle manufacturer can be essential for insurance and warranty purposes.
Alternate 315/25R19 Replacement Tire Sizes
Upsizing your wheels or tires? Replacement tires must be within 3% of the diametor of the original tire. The following sizes fall within that range - click on any size to see detailed info about that tire and wheel combination.
Size | Diameter | Width | Wheel |
---|---|---|---|
115/70R19 | 25.4" | 645 mm | 19 mm |
115/95R17 | 25.6" | 650 mm | 17 mm |
125/70R18 | 24.9" | 633 mm | 18 mm |
125/70R19 | 25.9" | 659 mm | 19 mm |
125/80R17 | 24.9" | 632 mm | 17 mm |
125/90R16 | 24.9" | 632 mm | 16 mm |
135/60R19 | 25.4" | 645 mm | 19 mm |
135/70R17 | 24.5" | 622 mm | 17 mm |
135/70R18 | 25.5" | 647 mm | 18 mm |
135/80R16 | 24.5" | 622 mm | 16 mm |
135/80R17 | 25.5" | 648 mm | 17 mm |
135/90R15 | 24.6" | 625 mm | 15 mm |
135/90R16 | 25.6" | 650 mm | 16 mm |
145/65R18 | 25.4" | 645 mm | 18 mm |
145/70R17 | 25" | 636 mm | 17 mm |
145/80R16 | 25.1" | 638 mm | 16 mm |
155/60R18 | 25.3" | 643 mm | 18 mm |
155/70R17 | 25.6" | 650 mm | 17 mm |
155/80R15 | 24.8" | 629 mm | 15 mm |
155/80R16 | 25.7" | 654 mm | 16 mm |
165/80R15 | 25.4" | 645 mm | 15 mm |
175/55R17 | 24.6" | 624 mm | 17 mm |
175/70R15 | 24.7" | 627 mm | 15 mm |
175/75R15 | 25.3" | 643 mm | 15 mm |
175/80R14 | 25" | 636 mm | 14 mm |
185/60R16 | 24.7" | 628 mm | 16 mm |
185/60R17 | 25.7" | 654 mm | 17 mm |
185/65R16 | 25.4" | 646 mm | 16 mm |
185/70R15 | 25.2" | 641 mm | 15 mm |
185/75R14 | 25" | 634 mm | 14 mm |
185/80R13 | 24.6" | 626 mm | 13 mm |
185/80R14 | 25.7" | 652 mm | 14 mm |
195/50R17 | 24.7" | 628 mm | 17 mm |
195/55R17 | 25.4" | 646 mm | 17 mm |
195/60R16 | 25.2" | 640 mm | 16 mm |
195/65R15 | 25" | 635 mm | 15 mm |
195/65R16 | 26" | 660 mm | 16 mm |
195/70R14 | 24.8" | 630 mm | 14 mm |
195/70R15 | 25.8" | 655 mm | 15 mm |
195/75R14 | 25.5" | 648 mm | 14 mm |
205/45R18 | 25.2" | 641 mm | 18 mm |
205/50R17 | 25.1" | 638 mm | 17 mm |
205/55R16 | 24.9" | 632 mm | 16 mm |
205/55R17 | 25.9" | 658 mm | 17 mm |
205/60R15 | 24.7" | 627 mm | 15 mm |
205/60R16 | 25.7" | 652 mm | 16 mm |
205/65R14 | 24.5" | 622 mm | 14 mm |
205/65R15 | 25.5" | 647 mm | 15 mm |
205/70R14 | 25.4" | 644 mm | 14 mm |
215/30R20 | 25.1" | 638 mm | 20 mm |
215/35R19 | 24.9" | 633 mm | 19 mm |
215/40R18 | 24.8" | 629 mm | 18 mm |
215/40R19 | 25.8" | 655 mm | 19 mm |
215/45R17 | 24.6" | 626 mm | 17 mm |
215/45R18 | 25.6" | 651 mm | 18 mm |
215/50R16 | 24.5" | 622 mm | 16 mm |
215/50R17 | 25.5" | 648 mm | 17 mm |
215/55R16 | 25.3" | 642 mm | 16 mm |
215/60R15 | 25.2" | 639 mm | 15 mm |
215/65R14 | 25" | 636 mm | 14 mm |
215/70R14 | 25.9" | 658 mm | 14 mm |
225/30R20 | 25.4" | 644 mm | 20 mm |
225/35R19 | 25.2" | 641 mm | 19 mm |
225/40R18 | 25.1" | 637 mm | 18 mm |
225/45R17 | 25" | 634 mm | 17 mm |
225/45R18 | 25.9" | 659 mm | 18 mm |
225/50R16 | 24.9" | 632 mm | 16 mm |
225/50R17 | 25.9" | 658 mm | 17 mm |
225/55R15 | 24.8" | 629 mm | 15 mm |
225/55R16 | 25.7" | 654 mm | 16 mm |
225/60R14 | 24.6" | 626 mm | 14 mm |
225/60R15 | 25.6" | 651 mm | 15 mm |
235/30R19 | 24.6" | 625 mm | 19 mm |
235/30R20 | 25.6" | 650 mm | 20 mm |
235/35R19 | 25.5" | 647 mm | 19 mm |
235/40R18 | 25.4" | 645 mm | 18 mm |
235/45R17 | 25.4" | 644 mm | 17 mm |
235/50R16 | 25.3" | 642 mm | 16 mm |
235/55R15 | 25.2" | 639 mm | 15 mm |
235/60R14 | 25.1" | 638 mm | 14 mm |
245/30R19 | 24.8" | 631 mm | 19 mm |
245/30R20 | 25.8" | 656 mm | 20 mm |
245/35R18 | 24.8" | 629 mm | 18 mm |
245/35R19 | 25.8" | 655 mm | 19 mm |
245/40R17 | 24.7" | 628 mm | 17 mm |
245/40R18 | 25.7" | 653 mm | 18 mm |
245/45R16 | 24.6" | 626 mm | 16 mm |
245/45R17 | 25.7" | 652 mm | 17 mm |
245/50R15 | 24.7" | 627 mm | 15 mm |
245/50R16 | 25.7" | 652 mm | 16 mm |
245/60R14 | 25.6" | 650 mm | 14 mm |
255/30R19 | 25.1" | 637 mm | 19 mm |
255/35R18 | 25" | 635 mm | 18 mm |
255/40R17 | 25" | 636 mm | 17 mm |
255/55R14 | 25" | 636 mm | 14 mm |
265/30R19 | 25.3" | 643 mm | 19 mm |
265/35R18 | 25.3" | 643 mm | 18 mm |
265/40R17 | 25.4" | 644 mm | 17 mm |
265/45R16 | 25.4" | 644 mm | 16 mm |
265/50R14 | 24.5" | 622 mm | 14 mm |
265/50R15 | 25.5" | 647 mm | 15 mm |
275/25R20 | 25.4" | 646 mm | 20 mm |
275/30R19 | 25.6" | 649 mm | 19 mm |
275/35R17 | 24.6" | 624 mm | 17 mm |
275/35R18 | 25.6" | 649 mm | 18 mm |
275/40R17 | 25.7" | 652 mm | 17 mm |
275/45R16 | 25.7" | 654 mm | 16 mm |
275/50R15 | 25.9" | 657 mm | 15 mm |
285/25R20 | 25.6" | 650 mm | 20 mm |
285/30R18 | 24.8" | 629 mm | 18 mm |
285/30R19 | 25.8" | 655 mm | 19 mm |
285/35R17 | 24.9" | 632 mm | 17 mm |
285/35R18 | 25.9" | 657 mm | 18 mm |
285/40R17 | 26" | 660 mm | 17 mm |
295/25R19 | 24.8" | 631 mm | 19 mm |
295/25R20 | 25.8" | 656 mm | 20 mm |
295/30R18 | 25" | 635 mm | 18 mm |
295/35R17 | 25.1" | 638 mm | 17 mm |
305/25R19 | 25" | 635 mm | 19 mm |
305/25R20 | 26" | 660 mm | 20 mm |
305/30R18 | 25.2" | 641 mm | 18 mm |
305/35R17 | 25.4" | 646 mm | 17 mm |
315/25R19 | 25.2" | 641 mm | 19 mm |
315/30R18 | 25.5" | 647 mm | 18 mm |
315/35R17 | 25.7" | 652 mm | 17 mm |
315/40R16 | 25.9" | 658 mm | 16 mm |
335/25R19 | 25.6" | 651 mm | 19 mm |
335/30R18 | 25.9" | 659 mm | 18 mm |
345/35R15 | 24.5" | 623 mm | 15 mm |