Vehicle Speed
MPH based on: Tire size, Rear-end Ratio 
and Engine RPMs
- - - - 
NA = 210 hp Natually Asparated (non-Turbo) Engine
FC=Forward Control, PT=Pusher
Tire size ... 11R 22.5
Michelin - XZA
(501 Tire Revolutions/Mile
Per MichelinTire Book -
Formula used for the following calculations:
RPM / RE ratio x 60 / revs per mile)
12R 22.5
XZA
(487 R/mile)
NA
FC
FC
PT
PT
PT
 PT
FC
PT
Ratio 5.29 4.65 4.63 3.55 3.42 3.36 3.73 4.88 3.42
RPM MPH MPH MPH MPH MPH MPH MPH MPH MPH
1400 
1450 
1500 
1550		 31.7 
32.8 
34.0 
35.1		 36.1 
37.3 
38.6 
39.9		 36.2 
37.5 
38.8 
40.1		 47.2 
48.9 
50.6 
52.3		 49.0 
50.8 
52.5 
54.3		 49.9 
51.7 
53.5 
55.2		 45.0
46.6
48.2
49.8		 35.3 
36.6 
37.9 
39.1		 50.4 
52.2 
54.0 
55.8
1600 
1650 
1700 
1750 		 36.2 
37.4 
38.5 
39.6		 41.2 
42.5 
43.8 
45.1		 41.4 
42.7 
44.0 
45.3		 54.0 
55.7 
57.4 
59.0		 56.0 
57.8 
59.5 
61.3		 57.0 
58.8 
60.6 
62.4		 51.4
53.0
54.6
56.2		 40.4 
41.7 
42.9 
44.2		 57.6 
59.4 
61.2 
63.0
1800 
1850 
1900 
1950		 40.8 
41.9 
43.0 
44.1		 46.4 
47.6 
48.9 
50.2		 46.6 
47.9 
49.1 
50.4		 60.7 
62.4 
64.1 
65.8		 63.0 
64.8 
66.5 
68.3		 64.2 
65.9 
67.7 
69.5		 57.8
59.4
61.0
62.6		 45.4 
46.7 
48.0 
49.2		 64.8 
66.6 
68.4 
70.2
2000 
2050 
2100 
2150		 45.3 
46.4 
47.5 
48.7		 51.5 
52.8 
54.1 
55.4		 51.7 
53.0 
54.3 
55.6		 67.5 
69.2 
70.8 
72.5		 70.0 
71.8 
73.5 
75.3		 71.3 
73.1 
74.9 
76.6		 64.2
65.8
67.4
69.0		 50.5 
51.8 
53.0 
54.3		 72.0 
73.8 
75.7 
77.5
2200 
2250 
2300 
2350		 49.8 
50.9 
52.1 
53.2		 56.7 
57.9 
59.2 
60.5		 56.9 
58.2 
59.5 
60.8		 74.2 
75.9 
77.6 
79.3		 77.0 
78.8 
80.5 
82.3		 78.4 
80.2 
80.2 
83.8		 70.6
72.2
73.8
75.5		 55.5 
56.8 
58.1 
59.3		 79.3 
81.1 
82.9 
84.7 
2400 
2450 
2500 
2550		 54.3 
55.5 
56.6 
57.7		 61.8 
63.1 
64.4 
65.7		 62.1 
63.4 
64.7 
66.0		 81.0 
82.7 
84.3 
86.0		 84.0 
85.8 
87.5 
89.3		 85.5 
87.3 
89.1 
90.9		 77.1
78.7
80.3
81.9		 60.6 
61.9 
63.1 
64.4		 86.5 
88.3 
90.1 
91.9
2600 
2650 
2700 
2750		 58.9 
60.0 
61.1 
62.3		 67.0 
68.3 
69.5 
70.8		 67.3 
68.5 
69.8 
71.1		 87.7 
89.4 
91.1 
92.8		 91.0 
92.8 
94.5 
96.3		 92.7 
94.5 
96.2 
98.0		 83.5
85.1
86.7
88.3		 65.6 
66.9 
68.2 
69.4		 93.7 
95.5 
97.3 
99.1
2800 
2850 
2900 
2950		 63.4 
64.5 
65.7 
66.8		 72.1 
73.4 
74.7 
76.0		 72.4 
73.7 
75.0 
76.3		 94.5 
96.1 
97.8 
99.5		 98.0 
99.8 
101.6 
103.3		 99.8 
101.6 
103.4 
105.1		 89.9
91.5
93.1
94.7		 70.7 
72.0 
73.2 
74.5		 100.9 
102.7 
104.5 
106.3
3000 67.9 77.3 77.6 101.2 105.1 106.9 96.3 75.7 108.1