Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/70r19 vs 185/50r19 Tire Comparison Side By Side
  135/70-19 185/50-19 Difference
Diameter inches (mm) 26.44 (671.6) 26.28 (667.6) -0.16 (-4) -0.6%
Width inches (mm) 5.31 (135) 7.28 (185) 1.97 (50) 37%
Circum. inches (mm) 83.07 (2109.89) 82.57 (2097.33) -0.49 (-12.57) -0.6%
Sidewall Height inches (mm) 3.72 (94.5) 3.64 (92.5) -0.08 (-2) -2.1%
Revolutions per mile (km) 762.76 (473.96) 767.33 (476.8) 4.57 (2.84) 0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.88 mph (32 km/h)
25 mph (40.23 km/h)24.85 mph (39.99 km/h)
30 mph (48.28 km/h)29.82 mph (47.99 km/h)
35 mph (56.33 km/h)34.79 mph (55.99 km/h)
40 mph (64.37 km/h)39.76 mph (63.99 km/h)
45 mph (72.42 km/h)44.73 mph (71.99 km/h)
50 mph (80.47 km/h)49.7 mph (79.99 km/h)
55 mph (88.51 km/h)54.67 mph (87.99 km/h)
60 mph (96.56 km/h)59.64 mph (95.99 km/h)
65 mph (104.61 km/h)64.61 mph (103.98 km/h)
70 mph (112.65 km/h)69.58 mph (111.98 km/h)
75 mph (120.7 km/h)74.55 mph (119.98 km/h)
80 mph (128.75 km/h)79.52 mph (127.98 km/h)
85 mph (136.79 km/h)84.49 mph (135.98 km/h)
90 mph (144.84 km/h)89.46 mph (143.98 km/h)
95 mph (152.89 km/h)94.43 mph (151.98 km/h)
100 mph (160.93 km/h)99.4 mph (159.98 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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