225/60R18 tire size: 28.63 in tall
Diameter, sidewall, width and revs per mile for 225/60R18, the common sizes within 3% of its diameter, and what each one does to the speedometer.
225/60R18, in short: 28.63 in (727 mm) tall and 225 mm (8.86 in) wide, with a 5.31 in (135.0 mm) sidewall, for a 18-inch wheel. Circumference is 89.94 in, so it turns about 704 times per mile (calculated from the nominal size).
Calculated from the size: sidewall = 225 × 60% = 135.00 mm; diameter = 2 × 5.315 in + 18 in; revs per mile = 63,360 ÷ (π × diameter).
Sizes within 3% of 225/60R18
19 common sizes come within ±3% of 28.63 in: 3 on the same 18-inch wheel, 8 plus-size and 8 minus-size. The last column is what the speedometer shows when the vehicle, set up for 225/60R18, is doing a true 60 mph.
| Size | Fit | Diameter | Difference | Width | Sidewall | Revs/mile (calc.) | Speedometer at a true 60 |
|---|---|---|---|---|---|---|---|
| 225/60R18 | This size | 28.63 in | - | 225 mm | 5.31 in | 704 | 60.0 mph |
| 215/70R16 | Minus 2 | 27.85 in | -2.72% | 215 mm | 5.93 in | 724 | 61.7 mph |
| 225/70R16 | Minus 2 | 28.40 in | -0.80% | 225 mm | 6.20 in | 710 | 60.5 mph |
| 235/70R16 | Minus 2 | 28.95 in | +1.13% | 235 mm | 6.48 in | 697 | 59.3 mph |
| 225/75R16 | Minus 2 | 29.29 in | +2.30% | 225 mm | 6.64 in | 689 | 58.7 mph |
| 215/65R17 | Minus 1 | 28.00 in | -2.19% | 215 mm | 5.50 in | 720 | 61.3 mph |
| 235/60R17 | Minus 1 | 28.10 in | -1.84% | 235 mm | 5.55 in | 718 | 61.1 mph |
| 225/65R17 | Minus 1 | 28.52 in | -0.40% | 225 mm | 5.76 in | 707 | 60.2 mph |
| 235/65R17 | Minus 1 | 29.03 in | +1.39% | 235 mm | 6.01 in | 695 | 59.2 mph |
| 235/55R18 | Same wheel | 28.18 in | -1.58% | 235 mm | 5.09 in | 716 | 61.0 mph |
| 255/55R18 | Same wheel | 29.04 in | +1.44% | 255 mm | 5.52 in | 694 | 59.1 mph |
| 235/60R18 | Same wheel | 29.10 in | +1.65% | 235 mm | 5.55 in | 693 | 59.0 mph |
| 255/45R19 | Plus 1 | 28.04 in | -2.08% | 255 mm | 4.52 in | 719 | 61.3 mph |
| 235/50R19 | Plus 1 | 28.25 in | -1.32% | 235 mm | 4.63 in | 714 | 60.8 mph |
| 225/55R19 | Plus 1 | 28.74 in | +0.40% | 225 mm | 4.87 in | 702 | 59.8 mph |
| 255/50R19 | Plus 1 | 29.04 in | +1.43% | 255 mm | 5.02 in | 695 | 59.2 mph |
| 235/55R19 | Plus 1 | 29.18 in | +1.91% | 235 mm | 5.09 in | 691 | 58.9 mph |
| 255/40R20 | Plus 2 | 28.03 in | -2.09% | 255 mm | 4.02 in | 719 | 61.3 mph |
| 245/45R20 | Plus 2 | 28.68 in | +0.18% | 245 mm | 4.34 in | 703 | 59.9 mph |
| 255/45R20 | Plus 2 | 29.04 in | +1.42% | 255 mm | 4.52 in | 695 | 59.2 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.
225/60R18 compared
225/60R18 side by side with 235/60R18 and 225/65R17: dimension by dimension, and what the swap does to the speedometer.
225/60R18 vs 235/60R18
+1.65% diameter| 225/60R18 | 235/60R18 | Difference | |
|---|---|---|---|
| Overall diameter | 28.63 in | 29.10 in | +0.47 in (+1.7%) |
| Section width | 225 mm | 235 mm | +10 mm |
| Sidewall height | 5.31 in | 5.55 in | +0.24 in |
| Wheel diameter | 18 in | 18 in | +0 in |
| Circumference | 89.9 in | 91.4 in | +1.5 in |
| Revs per mile (calc.) | 704 | 693 | -11 |
235/60R18 is 1.7% taller than 225/60R18. At a true 60 mph the speedometer shows 59.0 mph (it reads low), and when it shows 60 you're doing 61.0 mph.
225/60R18 vs 225/65R17
-0.40% diameter| 225/60R18 | 225/65R17 | Difference | |
|---|---|---|---|
| Overall diameter | 28.63 in | 28.52 in | -0.11 in (-0.4%) |
| Section width | 225 mm | 225 mm | +0 mm |
| Sidewall height | 5.31 in | 5.76 in | +0.44 in |
| Wheel diameter | 18 in | 17 in | -1 in |
| Circumference | 89.9 in | 89.6 in | -0.4 in |
| Revs per mile (calc.) | 704 | 707 | +3 |
225/65R17 is 0.4% shorter than 225/60R18. At a true 60 mph the speedometer shows 60.2 mph (it reads high), and when it shows 60 you're doing 59.8 mph.
Which vehicles come with 225/60R18
Vehicles sold in the US that have 225/60R18 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.
- Toyota RAV4 Hybrid 2025 model year · Hybrid SE, XLE Premium, XSE, Limited, Woodland EditionMavis Tire OE fitment page, 2025 Toyota RAV4 Hybrid XSE (size flagged standard 'S')
- Subaru Outback 2025 model year · Limited, Touring, Onyx Edition (incl. XT)Mavis Tire OE fitment page, 2025 Subaru Outback Limited (size flagged standard 'S')
- Chevrolet Equinox 2024 model year · PremierMavis Tire OE fitment page, 2024 Chevrolet Equinox Premier (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 225/60R18 tires
How tall is a 225/60R18 tire?
What is 225/60R18 in inches?
How many revolutions per mile does a 225/60R18 tire make?
What size can replace 225/60R18?
225/60R18 vs 235/60R18: what's the difference?
Which vehicles come with 225/60R18 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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