Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/70r15 vs 245/70r16 Tire Comparison Side By Side
  215/70-15 245/70-16 Difference
Diameter inches (mm) 26.85 (682) 29.5 (749.4) 2.65 (67.4) 9.9%
Width inches (mm) 8.46 (215) 9.65 (245) 1.18 (30) 14%
Circum. inches (mm) 84.35 (2142.57) 92.69 (2354.31) 8.34 (211.74) 9.9%
Sidewall Height inches (mm) 5.93 (150.5) 6.75 (171.5) 0.83 (21) 14%
Revolutions per mile (km) 751.13 (466.73) 683.57 (424.75) -67.56 (-41.98) -9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.98 mph (35.37 km/h)
25 mph (40.23 km/h)27.47 mph (44.21 km/h)
30 mph (48.28 km/h)32.96 mph (53.05 km/h)
35 mph (56.33 km/h)38.46 mph (61.89 km/h)
40 mph (64.37 km/h)43.95 mph (70.74 km/h)
45 mph (72.42 km/h)49.45 mph (79.58 km/h)
50 mph (80.47 km/h)54.94 mph (88.42 km/h)
55 mph (88.51 km/h)60.44 mph (97.26 km/h)
60 mph (96.56 km/h)65.93 mph (106.1 km/h)
65 mph (104.61 km/h)71.42 mph (114.95 km/h)
70 mph (112.65 km/h)76.92 mph (123.79 km/h)
75 mph (120.7 km/h)82.41 mph (132.63 km/h)
80 mph (128.75 km/h)87.91 mph (141.47 km/h)
85 mph (136.79 km/h)93.4 mph (150.31 km/h)
90 mph (144.84 km/h)98.89 mph (159.16 km/h)
95 mph (152.89 km/h)104.39 mph (168 km/h)
100 mph (160.93 km/h)109.88 mph (176.84 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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