Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/75r15 vs 26/7.5r15 Tire Comparison Side By Side
  135/75-15 26/7.5-15 Difference
Diameter inches (mm) 22.97 (583.5) 25.98 (659.86) 3.01 (76.36) 13.1%
Width inches (mm) 5.31 (135) 7.52 (191) 2.2 (56) 41.5%
Circum. inches (mm) 72.17 (1833.12) 81.61 (2073.01) 9.44 (239.89) 13.1%
Sidewall Height inches (mm) 3.99 (101.25) 5.49 (139.43) 1.5 (38.18) 37.7%
Revolutions per mile (km) 877.93 (545.52) 776.33 (482.39) -101.59 (-63.13) -11.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.62 mph (36.4 km/h)
25 mph (40.23 km/h)28.27 mph (45.5 km/h)
30 mph (48.28 km/h)33.93 mph (54.6 km/h)
35 mph (56.33 km/h)39.58 mph (63.7 km/h)
40 mph (64.37 km/h)45.23 mph (72.8 km/h)
45 mph (72.42 km/h)50.89 mph (81.9 km/h)
50 mph (80.47 km/h)56.54 mph (91 km/h)
55 mph (88.51 km/h)62.2 mph (100.1 km/h)
60 mph (96.56 km/h)67.85 mph (109.2 km/h)
65 mph (104.61 km/h)73.51 mph (118.3 km/h)
70 mph (112.65 km/h)79.16 mph (127.4 km/h)
75 mph (120.7 km/h)84.81 mph (136.5 km/h)
80 mph (128.75 km/h)90.47 mph (145.6 km/h)
85 mph (136.79 km/h)96.12 mph (154.7 km/h)
90 mph (144.84 km/h)101.78 mph (163.8 km/h)
95 mph (152.89 km/h)107.43 mph (172.9 km/h)
100 mph (160.93 km/h)113.09 mph (182 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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