2023 Honda Civic Si Tire Size

Size inch centimeter
Front Wheel Size
18 X 8 in 45.7 X 20.3 cm
Front Tire Size P235/40WR18
Rear Wheel Size 18 X 8 in 45.7 X 20.3 cm
Rear Tire Size P235/40WR18

car tire

Detailed Tire Size

Front Tire Size

P235/40WR18

Simplified Size: 235 - 40 - 18
P means: Passenger Vehicle

Tire width 235 (mm) 9.3 (inches)
Tire aspect ratio 40%
Tire's sidewall height 94 (mm) 3.7 (inches)
Rim/Wheel Size(diameter) 18 (inches)
Tire height 645.2 (mm) 25.4 (inches)
Tire circumference 2027 (mm) 79.8 (inches)
Tire Front View
9.3"
25.4"
Tire Side View
Wheel Side View
79.8"
18"
3.7"
794 Revs/Mile

Rear Tire Size

P235/40WR18

Simplified Size: 235 - 40 - 18
P means: Passenger Vehicle

Tire width 235 (mm) 9.3 (inches)
Tire aspect ratio 40%
Tire's sidewall height 94 (mm) 3.7 (inches)
Rim/Wheel Size(diameter) 18 (inches)
Tire height 645.2 (mm) 25.4 (inches)
Tire circumference 2027 (mm) 79.8 (inches)
Tire Front View
9.3"
25.4"
Tire Side View
Wheel Side View
79.8"
18"
3.7"
794 Revs/Mile

Tire Size Explained

The front tire size of 2023 Honda Civic Si Manual is P235/40WR18
or simplified to 235 - 40 - 18
Ex. P - 235 - 40- R - 18
Tire size on tire sidewall
P

Denotes the tires intended use.

P Passenger Vehicle
LT Light Truck
C Commercial Vehicle
T Temporary
ST Special Trailer
235 Width of the tire tread in millimeters.
40

Tire profile. The ratio of the height of the tread profile (sidewall) to the width of the tread. This value means that your tire has an aspect ratio of 40%.

R

Tire Construction. Radial is the standard construction method for about 99% of all tires.

R Radial
B Bias Belt
D Diagonal
18

Rim (wheel) diameter in inches.

Load Index
LOAD INDEX LOAD (lbs) LOAD INDEX LOAD (lbs) LOAD INDEX LOAD (lbs)
65 639 94 1477 123 3417
66 661 95 1521 124 3527
67 677 96 1565 125 3638
68 694 97 1609 126 3748
69 716 98 1653 127 3858
70 739 99 1709 128 3968
71 761 100 1764 129 4079
72 783 101 1819 130 4189
73 805 102 1874 131 4299
74 827 103 1929 132 4409
75 853 104 1984 133 4541
76 882 105 2039 134 4674
77 908 106 2094 135 4806
78 937 107 2149 136 4938
79 963 108 2205 137 5071
80 992 109 2271 138 5203
81 1019 110 2337 139 5357
82 1047 111 2403 140 5512
83 1074 112 2469 141 5677
84 1102 113 2535 142 5842
85 1135 114 2601 143 6008
86 1168 115 2679 144 6173
87 1201 116 2756 145 6393
88 1235 117 2833 146 6614
89 1279 118 2910 147 6779
90 1323 119 2998 148 6944
91 1356 120 3086 149 7165
92 1389 121 3197 150 7385
93 1433 122 3307    
Speed Rating
  Symbol Speed(mph)
  A1 3
  A2 6
  A3 9
  A4 12
  A5 16
  A6 19
  A7 22
  A8 25
  B 31
  C 37
  D 40
  E 43
  F 50
  G 56
  J 62
  K 68
  L 75
  M 81
  N 87
  P 93
  Q 99
  R 106
  S 112
  T 118
  U 124
  H 130
  V 149
ZR* above 186 mph, a ZR must appear in the size designation, including a Y speed symbol in brackets W 168
Y 186
(Y) Above 186

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