GEAR RATIO GUIDE FOR LARGER TIRES


Whenever you change tire size from the original size or from one size to another, this will have a direct effect on power and driveability. The chart below will help you to select the optimum gear ratio to bring the power and torque back to where you want them. Using the chart, first determine what your original gear ratio and tire size are, then follow the lines to find your approximate RPM at 65 MPH. Next find the new tire size on the left of the chart and look across to find the RPM closest to your original, the ratio listed at the top of that column will be your first choice for ratio. If you are interested in a change that will give more power or better mileage use the shaded coding as a guide.


GEAR RATIO CHART
 3.313.423.553.733.914.114.274.564.885.135.295.385.716.177.17
27 1955 2019 2096 2203 2309 2427 2521 2693 2882 3029 3124 3177 3372 3643 4234
28 1885 1947 2021 2124 2226 2340 2431 2596 2779 2921 3012 3063 3251 3513 4083
29 1820 1880 1952 2051 2150 2260 2347 2507 2683 2820 2908 2958 3139 3392 3942
30 1759 1818 1887 1982 2078 2184 2269 2423 2593 2726 2811 2859 3035 3279 3810
31 1702 1759 1826 1918 2011 2114 2196 2345 2510 2638 2721 2767 2937 3173 3688
32 1649 1704 1769 1858 1948 2048 2127 2272 2431 2556 2636 2680 2845 3074 3572
33 1599 1652 1715 1802 1889 1986 2063 2203 2358 2478 2556 2599 2759 2981 3464
34 1552 1604 1665 1749 1833 1927 2002 2138 2288 2406 2481 2523 2678 2893 3362
35 1508 1558 1617 1699 1781 1872 1945 2077 2223 2337 2410 2451 2601 2811 3266
36 1466 1515 1572 1652 1732 1820 1891 2019 2161 2272 2343 2383 2529 2732 3175
37 1426 1474 1530 1607 1685 1771 1840 1965 2103 2211 2279 2318 2460 2659 3090
38 1389 1435 1489 1565 1640 1724 1792 1913 2047 2152 2219 2257 2396 2589 3008
39 1353 1398 1451 1525 1598 1680 1746 1864 1995 2097 2163 2199 2334 2522 2931
40 1319 1363 1415 1487 1558 1638 1702 1818 1945 2045 2108 2144 2276 2459 2858
41 1287 1330 1380 1450 1520 1598 1660 1773 1898 1995 2057 2092 2220 2399 2788
42 1256 1298 1348 1416 1484 1560 1621 1731 1852 1947 2008 2042 2168 2342 2722
43 1227 1268 1316 1383 1450 1524 1583 1691 1809 1902 1961 1995 2117 2288 2658
44 1199 1239 1286 1352 1417 1489 1547 1652 1768 1859 1917 1949 2069 2236 2598
RECOMMENDED GEAR RATIO




Best Fuel Economy 2200 2533


Best Overall 2534 2867


Best Power 2868 3200



RPM CALCULATOR

Gear Ratio    


Calculated RPM
Automatic 0


Automatic w/Overdrive 0


Manual 0


5 or 6 Speed 0



GEAR RATIO CALCULATOR

Ring Gear   

Pinion Gear

Pinion Gear 0:1


TIRE DIAMETER CALCULATOR




Calculated Diameter 0





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