Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/40r26 vs 35/12.5r26 Tire Comparison Side By Side
  315/40-26 35/12.5-26 Difference
Diameter inches (mm) 35.92 (912.4) 35.01 (889.36) -0.91 (-23.04) -2.5%
Width inches (mm) 12.4 (315) 12.52 (318) 0.12 (3) 1%
Circum. inches (mm) 112.85 (2866.39) 110 (2794.01) -2.85 (-72.38) -2.5%
Sidewall Height inches (mm) 4.96 (126) 4.51 (114.48) -0.45 (-11.52) -9.1%
Revolutions per mile (km) 561.45 (348.87) 576 (357.91) 14.55 (9.04) 2.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.49 mph (31.37 km/h)
25 mph (40.23 km/h)24.37 mph (39.22 km/h)
30 mph (48.28 km/h)29.24 mph (47.06 km/h)
35 mph (56.33 km/h)34.12 mph (54.9 km/h)
40 mph (64.37 km/h)38.99 mph (62.75 km/h)
45 mph (72.42 km/h)43.86 mph (70.59 km/h)
50 mph (80.47 km/h)48.74 mph (78.44 km/h)
55 mph (88.51 km/h)53.61 mph (86.28 km/h)
60 mph (96.56 km/h)58.48 mph (94.12 km/h)
65 mph (104.61 km/h)63.36 mph (101.97 km/h)
70 mph (112.65 km/h)68.23 mph (109.81 km/h)
75 mph (120.7 km/h)73.11 mph (117.65 km/h)
80 mph (128.75 km/h)77.98 mph (125.5 km/h)
85 mph (136.79 km/h)82.85 mph (133.34 km/h)
90 mph (144.84 km/h)87.73 mph (141.18 km/h)
95 mph (152.89 km/h)92.6 mph (149.03 km/h)
100 mph (160.93 km/h)97.47 mph (156.87 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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