Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
345/35r15 vs 345/50r15 Tire Comparison Side By Side
  345/35-15 345/50-15 Difference
Diameter inches (mm) 24.51 (622.5) 28.58 (726) 4.07 (103.5) 16.6%
Width inches (mm) 13.58 (345) 13.58 (345) 0 (0) 0%
Circum. inches (mm) 76.99 (1955.64) 89.8 (2280.8) 12.8 (325.15) 16.6%
Sidewall Height inches (mm) 4.75 (120.75) 6.79 (172.5) 2.04 (51.75) 42.9%
Revolutions per mile (km) 822.92 (511.34) 705.61 (438.44) -117.32 (-72.9) -14.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.33 mph (37.54 km/h)
25 mph (40.23 km/h)29.16 mph (46.92 km/h)
30 mph (48.28 km/h)34.99 mph (56.31 km/h)
35 mph (56.33 km/h)40.82 mph (65.69 km/h)
40 mph (64.37 km/h)46.65 mph (75.08 km/h)
45 mph (72.42 km/h)52.48 mph (84.46 km/h)
50 mph (80.47 km/h)58.31 mph (93.85 km/h)
55 mph (88.51 km/h)64.14 mph (103.23 km/h)
60 mph (96.56 km/h)69.98 mph (112.62 km/h)
65 mph (104.61 km/h)75.81 mph (122 km/h)
70 mph (112.65 km/h)81.64 mph (131.38 km/h)
75 mph (120.7 km/h)87.47 mph (140.77 km/h)
80 mph (128.75 km/h)93.3 mph (150.15 km/h)
85 mph (136.79 km/h)99.13 mph (159.54 km/h)
90 mph (144.84 km/h)104.96 mph (168.92 km/h)
95 mph (152.89 km/h)110.8 mph (178.31 km/h)
100 mph (160.93 km/h)116.63 mph (187.69 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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