255/40R21 Tire Size
Understanding 255/40R21 tire size is crucial for making informed decisions when purchasing new tires, whether it is for replacement or upgrade, as it plays an important role in your vehicle's performance and safety. Let's explore 255/40R21 tire size specs and dimensions, what vehicles are equipped with 255/40R21 tires and what are its replacement alternatives.
What does 255/40R21 mean?
255/40R21 is a Metric tire size that is commonly used on passenger and crossover vehicles. Let us decode each aspect of 255/40R21 tire size dimensions for better understanding.
- 255 - this number indicates tire's section width, which includes the entire width of the tire from one sidewall to the other. The tread width is typically a bit narrower than the section width. Section width of this particular tire is 255 millimeters.
- 40 - this number represents the aspect ratio of a tire. It is the ratio of the tire's sidewall height to its width. For this particular tire size, tire's sidewall height is 40% of its tread width.
- R - this letter denotes that tire has radial construction.
- 21 - the last number indicates the wheel diameter in inches that the tire is designed to fit. 255/40R21 can be mounted on rims with 21 inches in diameter.
| Metric | Inches | |
|---|---|---|
| Tread Width | 255 mm | 10" |
| Aspect Ratio | 40% | |
| Rim Diameter | 533 mm | 21" |
| Tire Diameter | 737.4 mm | 29" |
| Sidewall Height | 102 mm | 4" |
| Circumference | 2315 mm | 91.1" |
| Revolutions | 432 per km | 695 per mile |
What is 255/40R21 in inches?
When converted to inches, 255/40R21 tire size is equivalent to 29x10R21. 29 inches indicate the tire diameter, 10 inches represent tread width, and 21 inches is the diameter of a rim the tire can be mounted on.
What vehicles use 255/40R21 tire size?
There are 19 vehicle models that use 255/40R21 as original equipment tire size. Select your vehicle model for more details.
- Alfa Romeo Stelvio Tire Size
- Audi Q5 Tire Size
- Audi Q5 Sportback Tire Size
- Audi SQ5 Tire Size
- Audi SQ5 Sportback Tire Size
- BMW 740i Tire Size
- BMW 760i xDrive Tire Size
- BMW i7 Tire Size
- BMW X3 Tire Size
- BMW X4 Tire Size
- Genesis GV60 Tire Size
- Genesis GV70 Tire Size
- Kia EV6 Tire Size
- Maserati Grecale Tire Size
- Mercedes-Benz GLC43 AMG Tire Size
- Rolls-Royce Dawn Tire Size
- Rolls-Royce Ghost Tire Size
- Rolls-Royce Wraith Tire Size
- Volvo XC60 Tire Size
What are replacement alternatives for 255/40R21 tire?
Replacement tires have to be within 3% of the original tire's overall diameter to ensure safe drive and proper speedometer readings. Below is a list of replacement and plus tire sizes that are within the optimal characteristics of the original 255/40R21 tire size.
Keep in mind that different vehicles have different tire requirements. Passenger cars, SUVs, trucks, and high-performance vehicles each have specific types of tires that are engineered for their particular needs. When replacing tires on your vehicle, always refer to your vehicle's owner's manual for manufacturer recommendations on tire size, type, and other specifications.
| Replacement Tire Size | Overall Diameter Difference |
|---|---|
| 245/40R21 | -1.1% |
| 245/45R21 | 2.3% |
| 265/35R21 | -2.5% |
| P265/35R21 | -2.5% |
| 265/40R21 | 1.1% |
| HL265/35R21 | -2.5% |
| P245/45R21 | 2.3% |
| P265/35R22 | 0.9% |
| 265/30R22 | -2.7% |
| 245/35R22 | -0.9% |
| 265/35R22 | 0.9% |
| 255/35R22 | 0% |
| P265/25R23 | -2.8% |
| 265/25R23 | -2.8% |
What wheels can 255/40R21 tire be mounted on?
255/40R21 tires are generally approved to be mounted on 8.5" to 10" wide wheels. The follwing wheel sizes can be used:
- 21x8.5
- 21x9
- 21x9.5
- 21x10
255/40R21 tire size comparison chart
| Tire Size | Overall Diameter Difference |
|---|---|
| 255/40R21 vs 255/45R21 | 3.5% |
| 255/40R21 vs HL265/35R21 | -2.5% |
| 255/40R21 vs 355/25R21 | -3.6% |
| 255/40R21 vs 345/25R21 | -4.3% |
| 255/40R21 vs 335/30R21 | -0.4% |
| 255/40R21 vs 325/40R21 | 7.6% |
| 255/40R21 vs 325/30R21 | -1.2% |
| 255/40R21 vs 315/45R21 | 10.8% |
| 255/40R21 vs 315/40R21 | 6.5% |
| 255/40R21 vs 315/35R21 | 2.3% |
| 255/40R21 vs 315/30R21 | -2% |
| 255/40R21 vs 305/35R21 | 1.3% |
| 255/40R21 vs 305/30R21 | -2.8% |
| 255/40R21 vs 295/30R21 | -3.7% |
| 255/40R21 vs 285/30R21 | -4.5% |
| 255/40R21 vs P265/45R21 | 4.7% |
| 255/40R21 vs HL245/35R21 | -4.4% |
| 255/40R21 vs 235/35R21 | -5.3% |
| 255/40R21 vs 235/45R21 | 1% |
| 255/40R21 vs 235/30R21 | -8.5% |
| 255/40R21 vs P255/45R21 | 3.5% |
| 255/40R21 vs 265/30R21 | -6.1% |
| 255/40R21 vs P315/35R21 | 2.3% |
| 255/40R21 vs P295/40R21 | 4.3% |
| 255/40R21 vs P275/35R21 | -1.5% |
| 255/40R21 vs P275/30R21 | -5.3% |
| 255/40R21 vs P265/35R21 | -2.5% |
| 255/40R21 vs P245/45R21 | 2.3% |
| 255/40R21 vs P245/35R21 | -4.4% |
| 255/40R21 vs 325/25R21 | -5.6% |
| 255/40R21 vs 305/25R21 | -7% |
| 255/40R21 vs 295/25R21 | -7.6% |
| 255/40R21 vs 275/25R21 | -9% |
| 255/40R21 vs 255/30R21 | -6.9% |
| 255/40R21 vs 245/30R21 | -7.7% |
| 255/40R21 vs 295/40R21 | 4.3% |
| 255/40R21 vs 275/35R21 | -1.5% |
| 255/40R21 vs 265/40R21 | 1.1% |
| 255/40R21 vs 285/35R21 | -0.6% |
| 255/40R21 vs 255/35R21 | -3.4% |
| 255/40R21 vs 275/55R21 | 13.4% |
| 255/40R21 vs 265/45R21 | 4.7% |
| 255/40R21 vs 245/35R21 | -4.4% |
| 255/40R21 vs 275/50R21 | 9.6% |
| 255/40R21 vs 245/45R21 | 2.3% |
| 255/40R21 vs 245/40R21 | -1.1% |
| 255/40R21 vs 375/20R21 | -7.3% |
| 255/40R21 vs 275/40R21 | 2.2% |
| 255/40R21 vs 275/30R21 | -5.3% |
| 255/40R21 vs 285/40R21 | 3.3% |
| 255/40R21 vs 275/45R21 | 5.9% |
| 255/40R21 vs 265/35R21 | -2.5% |
| 255/40R21 vs 285/45R21 | 7.1% |
| 255/40R21 vs 235/50R21 | 4.2% |
| 255/40R21 vs 255/50R21 | 6.9% |
| 255/40R21 vs 295/35R21 | 0.4% |
| 255/40R21 vs 225/45R21 | -0.2% |
| 255/40R21 vs LT355/40R22 | 14.3% |
| 255/40R21 vs P305/55R22 | 21.3% |
| 255/40R21 vs LT325/55R22 | 24.2% |
| 255/40R21 vs 275/25R22 | -5.6% |
| 255/40R21 vs LT275/50R22 | 13.1% |
| 255/40R21 vs LT325/50R22 | 19.9% |
| 255/40R21 vs LT315/45R22 | 14.2% |
| 255/40R21 vs P265/35R22 | 0.9% |
| 255/40R21 vs P305/45R22 | 13% |
| 255/40R21 vs 255/40R22 | 3.4% |
| 255/40R21 vs 255/35R22 | 0% |
| 255/40R21 vs P275/35R22 | 1.9% |
| 255/40R21 vs P275/40R22 | 5.6% |
| 255/40R21 vs 255/45R22 | 6.9% |
| 255/40R21 vs P285/40R22 | 6.7% |
| 255/40R21 vs P295/30R22 | -0.2% |
| 255/40R21 vs P295/40R22 | 7.8% |
| 255/40R21 vs LT375/45R22 | 21.5% |
| 255/40R21 vs LT305/50R22 | 17.2% |
| 255/40R21 vs LT275/55R22 | 16.8% |
| 255/40R21 vs 295/55R22 | 19.8% |
| 255/40R21 vs 265/25R22 | -6.2% |
| 255/40R21 vs 305/50R22 | 17.1% |
| 255/40R21 vs 325/45R22 | 15.5% |
| 255/40R21 vs 225/30R22 | -5.9% |
| 255/40R21 vs 315/50R22 | 18.5% |
| 255/40R21 vs 265/45R22 | 8.1% |
| 255/40R21 vs 285/50R22 | 14.4% |
| 255/40R21 vs 355/40R22 | 14.3% |
| 255/40R21 vs 355/60R22 | 33.6% |
| 255/40R21 vs 335/55R22 | 25.8% |
| 255/40R21 vs 315/45R22 | 14.2% |
| 255/40R21 vs 325/60R22 | 28.7% |
| 255/40R21 vs 275/40R22 | 5.6% |
| 255/40R21 vs LT305/40R22 | 8.9% |
| 255/40R21 vs LT315/50R22 | 18.5% |
| 255/40R21 vs 305/55R22 | 21.3% |
| 255/40R21 vs LT325/45R22 | 15.4% |
| 255/40R21 vs LT325/60R22 | 28.7% |
| 255/40R21 vs LT335/55R22 | 25.7% |
| 255/40R21 vs P265/50R22 | 11.7% |
| 255/40R21 vs P305/40R22 | 8.9% |
| 255/40R21 vs P315/45R22 | 14.2% |
| 255/40R21 vs 375/45R22 | 21.6% |
| 255/40R21 vs 275/55R22 | 16.8% |
| 255/40R21 vs 295/45R22 | 11.8% |
| 255/40R21 vs 295/50R22 | 15.8% |
| 255/40R21 vs P275/45R22 | 9.4% |
| 255/40R21 vs HL275/35R22 | 1.8% |
| 255/40R21 vs 275/50R22 | 13.1% |
| 255/40R21 vs 285/45R22 | 10.6% |
| 255/40R21 vs 325/35R22 | 6.6% |
| 255/40R21 vs 325/55R22 | 24.3% |
| 255/40R21 vs 275/45R22 | 9.4% |
| 255/40R21 vs 235/30R22 | -5.1% |
| 255/40R21 vs 275/35R22 | 1.9% |
| 255/40R21 vs 245/30R22 | -4.3% |
| 255/40R21 vs 285/30R22 | -1% |
| 255/40R21 vs P265/40R22 | 4.5% |
| 255/40R21 vs 315/35R22 | 5.7% |
| 255/40R21 vs P275/50R22 | 13.1% |
| 255/40R21 vs P285/45R22 | 10.6% |
| 255/40R21 vs HL275/50R22 | 13.1% |
| 255/40R21 vs 285/40R22 | 6.7% |
| 255/40R21 vs 295/30R22 | -0.2% |
| 255/40R21 vs 295/35R22 | 3.8% |
| 255/40R21 vs HL275/45R22 | 9.3% |
| 255/40R21 vs 285/35R22 | 2.8% |
| 255/40R21 vs 315/30R22 | 1.4% |
| 255/40R21 vs 305/40R22 | 8.9% |
| 255/40R21 vs 245/35R22 | -0.9% |
| 255/40R21 vs 265/50R22 | 11.7% |
| 255/40R21 vs 305/35R22 | 4.7% |
| 255/40R21 vs 305/45R22 | 13% |
| 255/40R21 vs 315/25R22 | -2.8% |
| 255/40R21 vs 325/40R22 | 11% |
| 255/40R21 vs 265/35R22 | 0.9% |
| 255/40R21 vs 325/50R22 | 19.9% |
| 255/40R21 vs 335/25R22 | -1.5% |
| 255/40R21 vs LT285/50R22 | 14.5% |
| 255/40R21 vs LT285/55R22 | 18.3% |
| 255/40R21 vs LT295/50R22 | 15.8% |
| 255/40R21 vs LT295/55R22 | 19.7% |
| 255/40R21 vs 305/30R22 | 0.6% |
| 255/40R21 vs 305/25R22 | -3.5% |
| 255/40R21 vs 295/40R22 | 7.8% |
| 255/40R21 vs 255/30R22 | -3.5% |
| 255/40R21 vs 265/30R22 | -2.7% |
| 255/40R21 vs 295/25R22 | -4.2% |
| 255/40R21 vs 265/40R22 | 4.5% |
| 255/40R21 vs 285/55R22 | 18.3% |
| 255/40R21 vs 275/30R22 | -1.8% |
| 255/40R21 vs 285/25R22 | -4.9% |
| 255/40R21 vs 305/25R23 | -0.1% |
| 255/40R21 vs 265/25R23 | -2.8% |
| 255/40R21 vs 315/25R23 | 0.6% |
| 255/40R21 vs 295/30R23 | 3.2% |
| 255/40R21 vs HL275/35R23 | 5.4% |
| 255/40R21 vs 285/40R23 | 10.1% |
| 255/40R21 vs P285/35R23 | 6.3% |
| 255/40R21 vs 275/40R23 | 9.1% |
| 255/40R21 vs HL315/30R23 | 4.8% |
| 255/40R21 vs 295/35R23 | 7.2% |
| 255/40R21 vs 325/35R23 | 10.1% |
| 255/40R21 vs P265/25R23 | -2.8% |
| 255/40R21 vs 325/30R23 | 5.7% |
| 255/40R21 vs P305/40R23 | 12.3% |
| 255/40R21 vs 305/35R23 | 8.2% |
| 255/40R21 vs 285/35R23 | 6.3% |
| 255/40R21 vs 305/40R23 | 12.3% |
All listed guides, data and/or calculations are for informational purposes only. Tire-Sizes.com does not warrant or make any representations regarding the accuracy of or the results of the use of this information.