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GEAR RATIOS |
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RPM vs Gear
Ratio |
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Engine
RPM @ 55 MPH by Tire Diameter (Inches) |
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When
selecting a gear ratio, you should consider tire size,
transmission ratio,
final gear ratio and engine RPM at cruise speed. |
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|
Gear Ratio |
Tire Size |
|
27" |
28" |
29" |
30" |
31" |
32" |
33" |
34" |
35" |
36" |
37" |
38" |
40" |
42" |
44" |
|
2.56:1 |
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 |
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 |
|
2.94:1 |
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 |
|
3.08:1 |
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 |
|
3.21:1 |
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 |
|
3.31:1 |
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 |
|
3.42:1 |
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 |
|
3.54:1 |
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 |
|
3.73:1 |
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 |
|
3.90:1 |
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 |
|
4.10:1 |
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 |
|
4.27:1 |
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 |
|
4.56:1 |
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 |
|
4.88:1 |
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 |
|
5.29:1 |
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 |
|
5.38:1 |
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 |
|
5.71:1 |
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 |
|
6.17:1 |
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 |
|
7.17:1 |
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 |
|
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Generally, the acceptable
RPM range is 2000 to 3000, which is represented by the
entire shaded area of the chart. |
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The optimum RPM range is
2300 to 2600, and it is represented by the green
shading. |
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