Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r16.5 vs 215/85r16 Tire Comparison Side By Side
  245/75-16.5 215/85-16 Difference
Diameter inches (mm) 30.97 (786.6) 30.39 (771.9) -0.58 (-14.7) -1.9%
Width inches (mm) 9.65 (245) 8.46 (215) -1.18 (-30) -12.2%
Circum. inches (mm) 97.29 (2471.18) 95.47 (2425) -1.82 (-46.18) -1.9%
Sidewall Height inches (mm) 7.23 (183.75) 7.19 (182.75) -0.04 (-1) -0.5%
Revolutions per mile (km) 651.25 (404.66) 663.65 (412.37) 12.4 (7.71) 1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.63 mph (31.59 km/h)
25 mph (40.23 km/h)24.53 mph (39.48 km/h)
30 mph (48.28 km/h)29.44 mph (47.38 km/h)
35 mph (56.33 km/h)34.35 mph (55.27 km/h)
40 mph (64.37 km/h)39.25 mph (63.17 km/h)
45 mph (72.42 km/h)44.16 mph (71.07 km/h)
50 mph (80.47 km/h)49.07 mph (78.96 km/h)
55 mph (88.51 km/h)53.97 mph (86.86 km/h)
60 mph (96.56 km/h)58.88 mph (94.76 km/h)
65 mph (104.61 km/h)63.79 mph (102.65 km/h)
70 mph (112.65 km/h)68.69 mph (110.55 km/h)
75 mph (120.7 km/h)73.6 mph (118.45 km/h)
80 mph (128.75 km/h)78.5 mph (126.34 km/h)
85 mph (136.79 km/h)83.41 mph (134.24 km/h)
90 mph (144.84 km/h)88.32 mph (142.13 km/h)
95 mph (152.89 km/h)93.22 mph (150.03 km/h)
100 mph (160.93 km/h)98.13 mph (157.93 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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