Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/70r17 vs 230/55r17 Tire Comparison Side By Side
  135/70-17 230/55-17 Difference
Diameter inches (mm) 24.44 (620.8) 26.96 (684.8) 2.52 (64) 10.3%
Width inches (mm) 5.31 (135) 9.06 (230) 3.74 (95) 70.4%
Circum. inches (mm) 76.78 (1950.3) 84.7 (2151.36) 7.92 (201.06) 10.3%
Sidewall Height inches (mm) 3.72 (94.5) 4.98 (126.5) 1.26 (32) 33.9%
Revolutions per mile (km) 825.18 (512.74) 748.06 (464.82) -77.12 (-47.92) -9.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.06 mph (35.51 km/h)
25 mph (40.23 km/h)27.58 mph (44.38 km/h)
30 mph (48.28 km/h)33.09 mph (53.26 km/h)
35 mph (56.33 km/h)38.61 mph (62.13 km/h)
40 mph (64.37 km/h)44.12 mph (71.01 km/h)
45 mph (72.42 km/h)49.64 mph (79.89 km/h)
50 mph (80.47 km/h)55.15 mph (88.76 km/h)
55 mph (88.51 km/h)60.67 mph (97.64 km/h)
60 mph (96.56 km/h)66.19 mph (106.52 km/h)
65 mph (104.61 km/h)71.7 mph (115.39 km/h)
70 mph (112.65 km/h)77.22 mph (124.27 km/h)
75 mph (120.7 km/h)82.73 mph (133.14 km/h)
80 mph (128.75 km/h)88.25 mph (142.02 km/h)
85 mph (136.79 km/h)93.76 mph (150.9 km/h)
90 mph (144.84 km/h)99.28 mph (159.77 km/h)
95 mph (152.89 km/h)104.79 mph (168.65 km/h)
100 mph (160.93 km/h)110.31 mph (177.53 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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