Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/35r15 vs 235/40r15 Tire Comparison Side By Side
  275/35-15 235/40-15 Difference
Diameter inches (mm) 22.58 (573.5) 22.4 (569) -0.18 (-4.5) -0.8%
Width inches (mm) 10.83 (275) 9.25 (235) -1.57 (-40) -14.5%
Circum. inches (mm) 70.93 (1801.7) 70.38 (1787.57) -0.56 (-14.14) -0.8%
Sidewall Height inches (mm) 3.79 (96.25) 3.7 (94) -0.09 (-2.25) -2.3%
Revolutions per mile (km) 893.23 (555.03) 900.3 (559.42) 7.06 (4.39) 0.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.84 mph (31.93 km/h)
25 mph (40.23 km/h)24.8 mph (39.92 km/h)
30 mph (48.28 km/h)29.76 mph (47.9 km/h)
35 mph (56.33 km/h)34.73 mph (55.89 km/h)
40 mph (64.37 km/h)39.69 mph (63.87 km/h)
45 mph (72.42 km/h)44.65 mph (71.85 km/h)
50 mph (80.47 km/h)49.61 mph (79.84 km/h)
55 mph (88.51 km/h)54.57 mph (87.82 km/h)
60 mph (96.56 km/h)59.53 mph (95.8 km/h)
65 mph (104.61 km/h)64.49 mph (103.79 km/h)
70 mph (112.65 km/h)69.45 mph (111.77 km/h)
75 mph (120.7 km/h)74.41 mph (119.75 km/h)
80 mph (128.75 km/h)79.37 mph (127.74 km/h)
85 mph (136.79 km/h)84.33 mph (135.72 km/h)
90 mph (144.84 km/h)89.29 mph (143.7 km/h)
95 mph (152.89 km/h)94.25 mph (151.69 km/h)
100 mph (160.93 km/h)99.22 mph (159.67 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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