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This 18 is almost an exact match for the stock 15" lace wheels.
Dimensions
| Dimension |
Tire A: 215/60 R 15
(25 x 8.46 x 15) |
Tire B: 225/40 R 18
(25 x 8.86 x 18) |
Difference |
| Width |
| Sidewall height |
| Overall height |
| Circumference | |
| 8.46" |
(215.00mm) |
| 5.08" |
(129.00mm) |
| 25.16" |
(639.00mm) |
| 79.03" |
(2007.48mm) | |
| 8.86" |
(225.00mm) |
| 3.54" |
(90.00mm) |
| 25.09" |
(637.20mm) |
| 78.81" |
(2001.82mm) | |
| +0.39" |
(+10.00mm) |
| -1.54" |
(-39.00mm) |
| -0.07" |
(-1.80mm) |
| -0.22" |
(-5.65mm) | | |
Speedometer Error
| Actual Speed |
Indicated Speed with Tire B |
Speedometer Error |
5 mph (8.04 kph) |
5.01 mph (8.07 kph) |
+0.01 mph (+0.02 kph) |
10 mph (16.09 kph) |
10.03 mph (16.14 kph) |
+0.03 mph (+0.05 kph) |
15 mph (24.13 kph) |
15.04 mph (24.20 kph) |
+0.04 mph (+0.07 kph) |
20 mph (32.18 kph) |
20.06 mph (32.27 kph) |
+0.06 mph (+0.09 kph) |
25 mph (40.23 kph) |
25.07 mph (40.34 kph) |
+0.07 mph (+0.11 kph) |
30 mph (48.27 kph) |
30.08 mph (48.41 kph) |
+0.08 mph (+0.14 kph) |
35 mph (56.31 kph) |
35.10 mph (56.47 kph) |
+0.10 mph (+0.16 kph) |
40 mph (64.36 kph) |
40.11 mph (64.54 kph) |
+0.11 mph (+0.18 kph) |
45 mph (72.41 kph) |
45.13 mph (72.61 kph) |
+0.13 mph (+0.20 kph) |
50 mph (80.45 kph) |
50.14 mph (80.68 kph) |
+0.14 mph (+0.23 kph) |
55 mph (88.50 kph) |
55.16 mph (88.74 kph) |
+0.16 mph (+0.25 kph) |
60 mph (96.54 kph) |
60.17 mph (96.81 kph) |
+0.17 mph (+0.27 kph) |
65 mph (104.58 kph) |
65.18 mph (104.88 kph) |
+0.18 mph (+0.30 kph) |
70 mph (112.63 kph) |
70.20 mph (112.95 kph) |
+0.20 mph (+0.32 kph) |
75 mph (120.67 kph) |
75.21 mph (121.02 kph) |
+0.21 mph (+0.34 kph) |
80 mph (128.72 kph) |
80.23 mph (129.08 kph) |
+0.23 mph (+0.36 kph) |
85 mph (136.76 kph) |
85.24 mph (137.15 kph) |
+0.24 mph (+0.39 kph) |
90 mph (144.81 kph) |
90.25 mph (145.22 kph) |
+0.25 mph (+0.41 kph) |
95 mph (152.85 kph) |
95.27 mph (153.29 kph) |
+0.27 mph (+0.43 kph) |
100 mph (160.90 kph) |
100.28 mph (161.35 kph) |
+0.28 mph (+0.45 kph) |
105 mph (168.94 kph) |
105.30 mph (169.42 kph) |
+0.30 mph (+0.48 kph) |
110 mph (176.99 kph) |
110.31 mph (177.49 kph) |
+0.31 mph (+0.50 kph) |
115 mph (185.03 kph) |
115.32 mph (185.56 kph) |
+0.32 mph (+0.52 kph) |
120 mph (193.08 kph) |
120.34 mph (193.63 kph) |
+0.34 mph (+0.55 kph) |
125 mph (201.12 kph) |
125.35 mph (201.69 kph) |
+0.35 mph (+0.57 kph) |
130 mph (209.17 kph) |
130.37 mph (209.76 kph) |
+0.37 mph (+0.59 kph) |
135 mph (217.22 kph) |
135.38 mph (217.83 kph) |
+0.38 mph (+0.61 kph) |
140 mph (225.26 kph) |
140.40 mph (225.90 kph) |
+0.40 mph (+0.64 kph) |
145 mph (233.31 kph) |
145.41 mph (233.96 kph) |
+0.41 mph (+0.66 kph) |
150 mph (241.35 kph) |
150.42 mph (242.03 kph) |
+0.42 mph (+0.68 kph) |
155 mph (249.40 kph) |
155.44 mph (250.10 kph) |
+0.44 mph (+0.70 kph) |
160 mph (257.44 kph) |
160.45 mph (258.17 kph) |
+0.45 mph (+0.73 kph) |
165 mph (265.49 kph) |
165.47 mph (266.23 kph) |
+0.47 mph (+0.75 kph) |
170 mph (273.53 kph) |
170.48 mph (274.30 kph) |
+0.48 mph (+0.77 kph) |
175 mph (281.57 kph) |
175.49 mph (282.37 kph) |
+0.49 mph (+0.80 kph) |
180 mph (289.62 kph) |
180.51 mph (290.44 kph) |
+0.51 mph (+0.82 kph) |
185 mph (297.67 kph) |
185.52 mph (298.51 kph) |
+0.52 mph (+0.84 kph) |
190 mph (305.71 kph) |
190.54 mph (306.57 kph) |
+0.54 mph (+0.86 kph) |
195 mph (313.75 kph) |
195.55 mph (314.64 kph) |
+0.55 mph (+0.89 kph) |
200 mph (321.80 kph) |
200.56 mph (322.71 kph) |
+0.56 mph (+0.91 kph) |
If your speedometer has been calibrated for 215/60 R 15 (25 x 8.46 x 15) tires, replacing them with 225/40 R 18's (29 x 8.86 x 18's) would result in the speedometer reading high by 0.28%.
Odometer Error
| Actual Mileage |
Indicated Mileage with Tire B |
Odometer Error |
1 mi (1.61 km) |
1.00 mi (1.61 km) |
+0.00 mi (+0.00 km) |
5 mi (8.04 km) |
5.01 mi (8.07 km) |
+0.01 mi (+0.02 km) |
10 mi (16.09 km) |
10.03 mi (16.14 km) |
+0.03 mi (+0.05 km) |
50 mi (80.45 km) |
50.14 mi (80.68 km) |
+0.14 mi (+0.23 km) |
100 mi (160.90 km) |
100.28 mi (161.35 km) |
+0.28 mi (+0.45 km) |
500 mi (804.50 km) |
501.41 mi (806.77 km) |
+1.41 mi (+2.27 km) |
1000 mi (1609.00 km) |
1002.82 mi (1613.55 km) |
+2.82 mi (+4.55 km) |
5000 mi (8045.00 km) |
5014.12 mi (8067.73 km) |
+14.12 mi (+22.73 km) |
10000 mi (16090.00 km) |
10028.25 mi (16135.45 km) |
+28.25 mi (+45.45 km) |
50000 mi (80450.00 km) |
50141.24 mi (80677.26 km) |
+141.24 mi (+227.26 km) |
100000 mi (160900.00 km) |
100282.48 mi (161354.52 km) |
+282.48 mi (+454.52 km) |
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Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.
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