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RPM vs. Gear Ratio

Engine RPM @ 55 MPH by Tire Diameter (in.)

When selecting a gear ratio, you should consider tire size, transmission ratio,
final gear ratio and engine RPM at cruise speed.

Gear Ratio                                                                                                                                    Tire Size
(:1)
27"
28"
29"
30"
31"
32"
33"
34"
35"
36"
37"
38"
40"
42"
44"
2.56
1,752
1,690
1,631
1,577
1,526
1,478
1,434
1,391
1,352
1,314
1,279
1,245
1,183
1,126
1,075
2.73
1,869
1,802
1,740
1,682
1,627
1,577
1,529
1,484
1,441
1,401
1,364
1,328
1,261
1,201
1,147
2.94
2,012
1,942
1,874
1,811
1,753
1,698
1,646
1,599
1,552
1,509
1,468
1,429
1,358
1,294
1,235
3.08
2,108
2,033
1,963
1,897
1,836
1,779
1,725
1,674
1,626
1,581
1,538
1,498
1,423
1,355
1,294
3.21
2,197
2,119
2,046
1,977
1,914
1,854
1,798
1,745
1,695
1,648
1,603
1,561
1,483
1,412
1,348
3.31
2,266
2,185
2,110
2,039
1,973
1,912
1,854
1,799
1,748
1,699
1,653
1,610
1,529
1,456
1,390
3.42
2,341
2,257
2,179
2,107
2,039
1,975
1,915
1,859
1,806
1,756
1,708
1,663
1,580
1,505
1,436
3.54
2,423
2,336
2,256
2,181
2,110
2,044
1,982
1,924
1,869
1,817
1,768
1,772
1,635
1,558
1,487
3.73
2,553
2,462
2,377
2,298
2,224
2,154
2,089
2,027
1,969
1,915
1,863
1,814
1,723
1,641
1,567
3.90
2,669
2,574
2,485
2,402
2,325
2,252
2,184
2,120
2,059
2,002
1,948
1,897
1,802
1,716
1,638
4.10
2,806
2,706
2,613
2,526
2,444
2,368
2,296
2,228
2,165
2,105
2,048
1,994
1,894
1,804
1,722
4.27
2,923
2,818
2,721
2,630
2,545
2,466
2,391
2,321
2,255
2,195
2,133
2,077
1,973
1,879
1,793
4.56
3,121
3,010
2,906
2,809
2,718
2,633
2,554
2,478
2,408
2,341
2,278
2,218
2,107
2,006
1,915
4.88
3,340
3,221
3,110
3,006
2,909
2,818
2,733
2,652
2,577
2,505
2,437
2,373
2,255
2,147
2,050
5.29
3,621
3,491
3,371
3,259
3,154
3,055
2,962
2,875
2,793
2,716
2,642
2,573
2,444
2,328
2,222
5.38
3,682
3,551
3,428
3,314
3,207
3,107
3,013
2,924
2,841
2,762
2,687
2,616
2,486
2,367
2,260
5.71
3,908
3,769
3,639
3,517
3,404
3,298
3,198
3,104
3,015
2,931
2,852
2,777
2,638
2,512
2,398
6.17
4,223
4,072
3,932
3,801
3,678
3,653
3,455
3,354
3,258
3,167
3,082
3,001
2,851
2,715
2,593
7.17
4,907
4,732
4,569
4,417
4,274
4,141
4,015
3,897
3,786
3,681
3,581
3,487
3,313
3,155
3,011

Generally, the acceptable RPM range is 2000 to 3000, which is represented by the entire shaded area of the chart. The optimum RPM range is 2300 to 2600, and it is represented by the green shading.

Discuss this chart in the Jeep Horizons forums.




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