Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/40r14 vs 235/40r14 Tire Comparison Side By Side
  195/40-14 235/40-14 Difference
Diameter inches (mm) 20.14 (511.6) 21.4 (543.6) 1.26 (32) 6.3%
Width inches (mm) 7.68 (195) 9.25 (235) 1.57 (40) 20.5%
Circum. inches (mm) 63.28 (1607.24) 67.24 (1707.77) 3.96 (100.53) 6.3%
Sidewall Height inches (mm) 3.07 (78) 3.7 (94) 0.63 (16) 20.5%
Revolutions per mile (km) 1001.31 (622.18) 942.37 (585.56) -58.94 (-36.63) -5.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.25 mph (34.2 km/h)
25 mph (40.23 km/h)26.56 mph (42.75 km/h)
30 mph (48.28 km/h)31.88 mph (51.3 km/h)
35 mph (56.33 km/h)37.19 mph (59.85 km/h)
40 mph (64.37 km/h)42.5 mph (68.4 km/h)
45 mph (72.42 km/h)47.81 mph (76.95 km/h)
50 mph (80.47 km/h)53.13 mph (85.5 km/h)
55 mph (88.51 km/h)58.44 mph (94.05 km/h)
60 mph (96.56 km/h)63.75 mph (102.6 km/h)
65 mph (104.61 km/h)69.07 mph (111.15 km/h)
70 mph (112.65 km/h)74.38 mph (119.7 km/h)
75 mph (120.7 km/h)79.69 mph (128.25 km/h)
80 mph (128.75 km/h)85 mph (136.8 km/h)
85 mph (136.79 km/h)90.32 mph (145.35 km/h)
90 mph (144.84 km/h)95.63 mph (153.9 km/h)
95 mph (152.89 km/h)100.94 mph (162.45 km/h)
100 mph (160.93 km/h)106.25 mph (171 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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