225/45R17 tire size: 24.97 in tall
Diameter, sidewall, width and revs per mile for 225/45R17, the common sizes within 3% of its diameter, and what each one does to the speedometer.
225/45R17, in short: 24.97 in (634 mm) tall and 225 mm (8.86 in) wide, with a 3.99 in (101.2 mm) sidewall, for a 17-inch wheel. Circumference is 78.45 in, so it turns about 808 times per mile (calculated from the nominal size).
Calculated from the size: sidewall = 225 × 45% = 101.25 mm; diameter = 2 × 3.986 in + 17 in; revs per mile = 63,360 ÷ (π × diameter).
Sizes within 3% of 225/45R17
16 common sizes come within ±3% of 24.97 in: 5 on the same 17-inch wheel, 5 plus-size and 6 minus-size. The last column is what the speedometer shows when the vehicle, set up for 225/45R17, is doing a true 60 mph.
| Size | Fit | Diameter | Difference | Width | Sidewall | Revs/mile (calc.) | Speedometer at a true 60 |
|---|---|---|---|---|---|---|---|
| 225/45R17 | This size | 24.97 in | - | 225 mm | 3.99 in | 808 | 60.0 mph |
| 195/65R15 | Minus 2 | 24.98 in | +0.03% | 195 mm | 4.99 in | 807 | 60.0 mph |
| 205/65R15 | Minus 2 | 25.49 in | +2.08% | 205 mm | 5.25 in | 791 | 58.8 mph |
| 195/55R16 | Minus 1 | 24.44 in | -2.11% | 195 mm | 4.22 in | 825 | 61.3 mph |
| 205/55R16 | Minus 1 | 24.88 in | -0.38% | 205 mm | 4.44 in | 811 | 60.2 mph |
| 215/55R16 | Minus 1 | 25.31 in | +1.36% | 215 mm | 4.66 in | 797 | 59.2 mph |
| 205/60R16 | Minus 1 | 25.69 in | +2.85% | 205 mm | 4.84 in | 785 | 58.3 mph |
| 215/45R17 | Same wheel | 24.62 in | -1.42% | 215 mm | 3.81 in | 819 | 60.9 mph |
| 205/50R17 | Same wheel | 25.07 in | +0.39% | 205 mm | 4.04 in | 804 | 59.8 mph |
| 235/45R17 | Same wheel | 25.33 in | +1.42% | 235 mm | 4.16 in | 796 | 59.2 mph |
| 215/50R17 | Same wheel | 25.46 in | +1.97% | 215 mm | 4.23 in | 792 | 58.8 mph |
| 245/45R17 | Same wheel | 25.68 in | +2.84% | 245 mm | 4.34 in | 785 | 58.3 mph |
| 255/35R18 | Plus 1 | 25.03 in | +0.22% | 255 mm | 3.51 in | 806 | 59.9 mph |
| 225/40R18 | Plus 1 | 25.09 in | +0.46% | 225 mm | 3.54 in | 804 | 59.7 mph |
| 235/40R18 | Plus 1 | 25.40 in | +1.72% | 235 mm | 3.70 in | 794 | 59.0 mph |
| 215/45R18 | Plus 1 | 25.62 in | +2.59% | 215 mm | 3.81 in | 787 | 58.5 mph |
| 245/40R18 | Plus 1 | 25.72 in | +2.98% | 245 mm | 3.86 in | 784 | 58.3 mph |
A taller tire makes the speedometer read low, a shorter one high. Plus-sizing keeps the diameter close by trading sidewall for wheel. Any replacement needs a load index at least as high as the vehicle's tire placard calls for, and a wheel width the tire is approved for.
225/45R17 compared
225/45R17 side by side with 225/50R17 and 245/40R18: dimension by dimension, and what the swap does to the speedometer.
225/45R17 vs 225/50R17
+3.55% diameter| 225/45R17 | 225/50R17 | Difference | |
|---|---|---|---|
| Overall diameter | 24.97 in | 25.86 in | +0.89 in (+3.5%) |
| Section width | 225 mm | 225 mm | +0 mm |
| Sidewall height | 3.99 in | 4.43 in | +0.44 in |
| Wheel diameter | 17 in | 17 in | +0 in |
| Circumference | 78.5 in | 81.2 in | +2.8 in |
| Revs per mile (calc.) | 808 | 780 | -28 |
225/50R17 is 3.5% taller than 225/45R17. At a true 60 mph the speedometer shows 57.9 mph (it reads low), and when it shows 60 you're doing 62.1 mph.
225/45R17 vs 245/40R18
+2.98% diameter| 225/45R17 | 245/40R18 | Difference | |
|---|---|---|---|
| Overall diameter | 24.97 in | 25.72 in | +0.74 in (+3.0%) |
| Section width | 225 mm | 245 mm | +20 mm |
| Sidewall height | 3.99 in | 3.86 in | -0.13 in |
| Wheel diameter | 17 in | 18 in | +1 in |
| Circumference | 78.5 in | 80.8 in | +2.3 in |
| Revs per mile (calc.) | 808 | 784 | -23 |
245/40R18 is 3.0% taller than 225/45R17. At a true 60 mph the speedometer shows 58.3 mph (it reads low), and when it shows 60 you're doing 61.8 mph.
Which vehicles come with 225/45R17
Vehicles sold in the US that have 225/45R17 as the standard size on these trims, with the page that lists it. The tire placard on the driver's door edge or post has the size, and the load and inflation, for the exact vehicle.
- Hyundai Elantra 2025 model year · Limited (also Limited Hybrid, SEL Convenience)Mavis Tire OE fitment page, 2025 Hyundai Elantra Limited (size flagged standard 'S')
Vehicles mostly picked from Carscoops: 2025 U.S. car sales, full-year top 25 (Car and Driver data, January 2026).
Questions about 225/45R17 tires
How tall is a 225/45R17 tire?
What is 225/45R17 in inches?
How many revolutions per mile does a 225/45R17 tire make?
What size can replace 225/45R17?
225/45R17 vs 225/50R17: what's the difference?
Which vehicles come with 225/45R17 tires?
How these numbers are worked out
- NHTSA: Tire safety, everything rides on it (reading the sidewall and the placard)
- Tire Rack: How do I calculate tire dimensions?
- Jalopnik: What the 3% rule means for your tires (April 2026)
Checked October 2026. Dimensions are nominal, calculated from the size designation. A real tire's diameter, width and revs per mile vary by brand, tread depth, rim width and load, so check the maker's spec sheet.
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