Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/65r18 vs 245/60r18 Tire Comparison Side By Side
  255/65-18 245/60-18 Difference
Diameter inches (mm) 31.05 (788.7) 29.57 (751.2) -1.48 (-37.5) -4.8%
Width inches (mm) 10.04 (255) 9.65 (245) -0.39 (-10) -3.9%
Circum. inches (mm) 97.55 (2477.77) 92.91 (2359.96) -4.64 (-117.81) -4.8%
Sidewall Height inches (mm) 6.53 (165.75) 5.79 (147) -0.74 (-18.75) -11.3%
Revolutions per mile (km) 649.51 (403.59) 681.94 (423.73) 32.42 (20.15) 5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.05 mph (30.66 km/h)
25 mph (40.23 km/h)23.81 mph (38.32 km/h)
30 mph (48.28 km/h)28.57 mph (45.98 km/h)
35 mph (56.33 km/h)33.34 mph (53.65 km/h)
40 mph (64.37 km/h)38.1 mph (61.31 km/h)
45 mph (72.42 km/h)42.86 mph (68.98 km/h)
50 mph (80.47 km/h)47.62 mph (76.64 km/h)
55 mph (88.51 km/h)52.38 mph (84.31 km/h)
60 mph (96.56 km/h)57.15 mph (91.97 km/h)
65 mph (104.61 km/h)61.91 mph (99.63 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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