Welcome to johnmeister.com/jeep/sj
2.72 gearing information - tires vs. rpm
tire size vs. rpm and speed
=($A17*I$4*PI()*60)/(I$3*12*5280)
a17 is engine rpm
I4 is tire diameter estimated 30.38 for the 31x10.5's...
Pi is pi... :) 3.1416
I3 is the gear ratio... in this case 3.31
Note: Tire diameter is in INCHES. Speed in Miles per hour. Tach = rpm
back to johnmeister.com/jeep/sj
Gears: |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
2.72 |
Tires: |
28.88 |
29.38 |
29.88 |
30.38 |
30.88 |
31.38 |
31.88 |
32.38 |
32.88 |
33.38 |
33.88 |
34.38 |
34.88 |
35.38 |
35.88 |
36.38 |
36.88 |
37.38 |
37.88 |
tach |
mph |
mph |
mph |
mph |
mph |
mph |
mph |
mph |
mph |
mph |
mph |
mph |
mph |
mph |
mph |
mph |
mph |
mph |
mph |
600 |
18.95 |
19.28 |
19.61 |
19.94 |
20.26 |
20.59 |
20.92 |
21.25 |
21.58 |
21.91 |
22.23 |
22.56 |
22.89 |
23.22 |
23.55 |
23.87 |
24.20 |
24.53 |
24.86 |
700 |
22.11 |
22.49 |
22.88 |
23.26 |
23.64 |
24.03 |
24.41 |
24.79 |
25.17 |
25.56 |
25.94 |
26.32 |
26.70 |
27.09 |
27.47 |
27.85 |
28.24 |
28.62 |
29.00 |
800 |
25.27 |
25.71 |
26.14 |
26.58 |
27.02 |
27.46 |
27.89 |
28.33 |
28.77 |
29.21 |
29.64 |
30.08 |
30.52 |
30.96 |
31.39 |
31.83 |
32.27 |
32.71 |
33.14 |
900 |
28.43 |
28.92 |
29.41 |
29.91 |
30.40 |
30.89 |
31.38 |
31.87 |
32.37 |
32.86 |
33.35 |
33.84 |
34.33 |
34.83 |
35.32 |
35.81 |
36.30 |
36.80 |
37.29 |
1000 |
31.59 |
32.13 |
32.68 |
33.23 |
33.77 |
34.32 |
34.87 |
35.42 |
35.96 |
36.51 |
37.06 |
37.60 |
38.15 |
38.70 |
39.24 |
39.79 |
40.34 |
40.88 |
41.43 |
1100 |
34.75 |
35.35 |
35.95 |
36.55 |
37.15 |
37.75 |
38.36 |
38.96 |
39.56 |
40.16 |
40.76 |
41.36 |
41.96 |
42.57 |
43.17 |
43.77 |
44.37 |
44.97 |
45.57 |
1200 |
37.90 |
38.56 |
39.22 |
39.87 |
40.53 |
41.19 |
41.84 |
42.50 |
43.15 |
43.81 |
44.47 |
45.12 |
45.78 |
46.44 |
47.09 |
47.75 |
48.40 |
49.06 |
49.72 |
1300 |
41.06 |
41.77 |
42.49 |
43.20 |
43.91 |
44.62 |
45.33 |
46.04 |
46.75 |
47.46 |
48.17 |
48.88 |
49.59 |
50.31 |
51.02 |
51.73 |
52.44 |
53.15 |
53.86 |
1400 |
44.22 |
44.99 |
45.75 |
46.52 |
47.28 |
48.05 |
48.82 |
49.58 |
50.35 |
51.11 |
51.88 |
52.64 |
53.41 |
54.18 |
54.94 |
55.71 |
56.47 |
57.24 |
58.00 |
1500 |
47.38 |
48.20 |
49.02 |
49.84 |
50.66 |
51.48 |
52.30 |
53.12 |
53.94 |
54.76 |
55.58 |
56.40 |
57.22 |
58.05 |
58.87 |
59.69 |
60.51 |
61.33 |
62.15 |
1600 |
50.54 |
51.41 |
52.29 |
53.16 |
54.04 |
54.91 |
55.79 |
56.66 |
57.54 |
58.41 |
59.29 |
60.16 |
61.04 |
61.91 |
62.79 |
63.66 |
64.54 |
65.41 |
66.29 |
1700 |
53.70 |
54.63 |
55.56 |
56.49 |
57.42 |
58.35 |
59.28 |
60.21 |
61.14 |
62.07 |
63.00 |
63.93 |
64.85 |
65.78 |
66.71 |
67.64 |
68.57 |
69.50 |
70.43 |
1750 |
55.28 |
56.24 |
57.19 |
58.15 |
59.11 |
60.06 |
61.02 |
61.98 |
62.93 |
63.89 |
64.85 |
65.81 |
66.76 |
67.72 |
68.68 |
69.63 |
70.59 |
71.55 |
72.50 |
1850 |
58.44 |
59.45 |
60.46 |
61.47 |
62.48 |
63.50 |
64.51 |
65.52 |
66.53 |
67.54 |
68.55 |
69.57 |
70.58 |
71.59 |
72.60 |
73.61 |
74.62 |
75.64 |
76.65 |
1950 |
61.60 |
62.66 |
63.73 |
64.79 |
65.86 |
66.93 |
67.99 |
69.06 |
70.13 |
71.19 |
72.26 |
73.33 |
74.39 |
75.46 |
76.53 |
77.59 |
78.66 |
79.72 |
80.79 |
2050 |
64.75 |
65.88 |
67.00 |
68.12 |
69.24 |
70.36 |
71.48 |
72.60 |
73.72 |
74.84 |
75.97 |
77.09 |
78.21 |
79.33 |
80.45 |
81.57 |
82.69 |
83.81 |
84.93 |
2150 |
67.91 |
69.09 |
70.26 |
71.44 |
72.62 |
73.79 |
74.97 |
76.14 |
77.32 |
78.49 |
79.67 |
80.85 |
82.02 |
83.20 |
84.37 |
85.55 |
86.73 |
87.90 |
89.08 |
2250 |
71.07 |
72.30 |
73.53 |
74.76 |
75.99 |
77.22 |
78.45 |
79.68 |
80.92 |
82.15 |
83.38 |
84.61 |
85.84 |
87.07 |
88.30 |
89.53 |
90.76 |
91.99 |
93.22 |
2350 |
74.23 |
75.52 |
76.80 |
78.09 |
79.37 |
80.66 |
81.94 |
83.23 |
84.51 |
85.80 |
87.08 |
88.37 |
89.65 |
90.94 |
92.22 |
93.51 |
94.79 |
96.08 |
97.36 |
2450 |
77.39 |
78.73 |
80.07 |
81.41 |
82.75 |
84.09 |
85.43 |
86.77 |
88.11 |
89.45 |
90.79 |
92.13 |
93.47 |
94.81 |
96.15 |
97.49 |
98.83 |
100.17 |
101.51 |
2550 |
80.55 |
81.94 |
83.34 |
84.73 |
86.13 |
87.52 |
88.92 |
90.31 |
91.70 |
93.10 |
94.49 |
95.89 |
97.28 |
98.68 |
100.07 |
101.47 |
102.86 |
104.25 |
105.65 |
2650 |
83.71 |
85.16 |
86.61 |
88.05 |
89.50 |
90.95 |
92.40 |
93.85 |
95.30 |
96.75 |
98.20 |
99.65 |
101.10 |
102.55 |
104.00 |
105.44 |
106.89 |
108.34 |
109.79 |
2750 |
86.87 |
88.37 |
89.87 |
91.38 |
92.88 |
94.38 |
95.89 |
97.39 |
98.90 |
100.40 |
101.90 |
103.41 |
104.91 |
106.42 |
107.92 |
109.42 |
110.93 |
112.43 |
113.94 |
2850 |
90.02 |
91.58 |
93.14 |
94.70 |
96.26 |
97.82 |
99.38 |
100.93 |
102.49 |
104.05 |
105.61 |
107.17 |
108.73 |
110.29 |
111.84 |
113.40 |
114.96 |
116.52 |
118.08 |
2950 |
93.18 |
94.80 |
96.41 |
98.02 |
99.64 |
101.25 |
102.86 |
104.48 |
106.09 |
107.70 |
109.32 |
110.93 |
112.54 |
114.16 |
115.77 |
117.38 |
119.00 |
120.61 |
122.22 |
3050 |
96.34 |
98.01 |
99.68 |
101.35 |
103.01 |
104.68 |
106.35 |
108.02 |
109.69 |
111.35 |
113.02 |
114.69 |
116.36 |
118.03 |
119.69 |
121.36 |
123.03 |
124.70 |
126.37 |
3150 |
99.50 |
101.22 |
102.95 |
104.67 |
106.39 |
108.11 |
109.84 |
111.56 |
113.28 |
115.00 |
116.73 |
118.45 |
120.17 |
121.89 |
123.62 |
125.34 |
127.06 |
128.79 |
130.51 |
3250 |
102.66 |
104.44 |
106.21 |
107.99 |
109.77 |
111.55 |
113.32 |
115.10 |
116.88 |
118.66 |
120.43 |
122.21 |
123.99 |
125.76 |
127.54 |
129.32 |
131.10 |
132.87 |
134.65 |
3350 |
105.82 |
107.65 |
109.48 |
111.31 |
113.15 |
114.98 |
116.81 |
118.64 |
120.47 |
122.31 |
124.14 |
125.97 |
127.80 |
129.63 |
131.47 |
133.30 |
135.13 |
136.96 |
138.79 |
3450 |
108.98 |
110.86 |
112.75 |
114.64 |
116.52 |
118.41 |
120.30 |
122.18 |
124.07 |
125.96 |
127.84 |
129.73 |
131.62 |
133.50 |
135.39 |
137.28 |
139.16 |
141.05 |
142.94 |
3550 |
112.14 |
114.08 |
116.02 |
117.96 |
119.90 |
121.84 |
123.78 |
125.73 |
127.67 |
129.61 |
131.55 |
133.49 |
135.43 |
137.37 |
139.31 |
141.26 |
143.20 |
145.14 |
147.08 |
3650 |
115.29 |
117.29 |
119.29 |
121.28 |
123.28 |
125.27 |
127.27 |
129.27 |
131.26 |
133.26 |
135.25 |
137.25 |
139.25 |
141.24 |
143.24 |
145.24 |
147.23 |
149.23 |
151.22 |
3750 |
118.45 |
120.50 |
122.55 |
124.61 |
126.66 |
128.71 |
130.76 |
132.81 |
134.86 |
136.91 |
138.96 |
141.01 |
143.06 |
145.11 |
147.16 |
149.21 |
151.27 |
153.32 |
155.37 |
3850 |
121.61 |
123.72 |
125.82 |
127.93 |
130.03 |
132.14 |
134.24 |
136.35 |
138.46 |
140.56 |
142.67 |
144.77 |
146.88 |
148.98 |
151.09 |
153.19 |
155.30 |
157.40 |
159.51 |
3950 |
124.77 |
126.93 |
129.09 |
131.25 |
133.41 |
135.57 |
137.73 |
139.89 |
142.05 |
144.21 |
146.37 |
148.53 |
150.69 |
152.85 |
155.01 |
157.17 |
159.33 |
161.49 |
163.65 |
4050 |
127.93 |
130.14 |
132.36 |
134.57 |
136.79 |
139.00 |
141.22 |
143.43 |
145.65 |
147.86 |
150.08 |
152.29 |
154.51 |
156.72 |
158.94 |
161.15 |
163.37 |
165.58 |
167.80 |
4150 |
131.09 |
133.36 |
135.63 |
137.90 |
140.17 |
142.44 |
144.70 |
146.97 |
149.24 |
151.51 |
153.78 |
156.05 |
158.32 |
160.59 |
162.86 |
165.13 |
167.40 |
169.67 |
171.94 |
4250 |
134.25 |
136.57 |
138.89 |
141.22 |
143.54 |
145.87 |
148.19 |
150.52 |
152.84 |
155.16 |
157.49 |
159.81 |
162.14 |
164.46 |
166.79 |
169.11 |
171.43 |
173.76 |
176.08 |
4350 |
137.41 |
139.78 |
142.16 |
144.54 |
146.92 |
149.30 |
151.68 |
154.06 |
156.44 |
158.82 |
161.19 |
163.57 |
165.95 |
168.33 |
170.71 |
173.09 |
175.47 |
177.85 |
180.23 |
4450 |
140.56 |
143.00 |
145.43 |
147.86 |
150.30 |
152.73 |
155.17 |
157.60 |
160.03 |
162.47 |
164.90 |
167.33 |
169.77 |
172.20 |
174.63 |
177.07 |
179.50 |
181.94 |
184.37 |
4550 |
143.72 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
4650 |
146.88 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
4750 |
150.04 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
4850 |
153.20 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
4950 |
156.36 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
5050 |
159.52 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Last Updated on 11/8/99
By John Meister
Email: john@johnmeister.com/jeep/sj