Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/45r18 vs 215/60r16 Tire Comparison Side By Side
  235/45-18 215/60-16 Difference
Diameter inches (mm) 26.33 (668.7) 26.16 (664.4) -0.17 (-4.3) -0.6%
Width inches (mm) 9.25 (235) 8.46 (215) -0.79 (-20) -8.5%
Circum. inches (mm) 82.71 (2100.78) 82.18 (2087.27) -0.53 (-13.51) -0.6%
Sidewall Height inches (mm) 4.16 (105.75) 5.08 (129) 0.92 (23.25) 22%
Revolutions per mile (km) 766.07 (476.01) 771.03 (479.09) 4.96 (3.08) 0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.87 mph (31.98 km/h)
25 mph (40.23 km/h)24.84 mph (39.97 km/h)
30 mph (48.28 km/h)29.81 mph (47.97 km/h)
35 mph (56.33 km/h)34.77 mph (55.96 km/h)
40 mph (64.37 km/h)39.74 mph (63.96 km/h)
45 mph (72.42 km/h)44.71 mph (71.95 km/h)
50 mph (80.47 km/h)49.68 mph (79.95 km/h)
55 mph (88.51 km/h)54.65 mph (87.94 km/h)
60 mph (96.56 km/h)59.61 mph (95.94 km/h)
65 mph (104.61 km/h)64.58 mph (103.93 km/h)
70 mph (112.65 km/h)69.55 mph (111.93 km/h)
75 mph (120.7 km/h)74.52 mph (119.92 km/h)
80 mph (128.75 km/h)79.49 mph (127.92 km/h)
85 mph (136.79 km/h)84.45 mph (135.91 km/h)
90 mph (144.84 km/h)89.42 mph (143.91 km/h)
95 mph (152.89 km/h)94.39 mph (151.9 km/h)
100 mph (160.93 km/h)99.36 mph (159.9 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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