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Knowledge Jeep Math 101 Jeep Math 101 Gear Ratios Speedo Calculator Crawl Calculator Tire Size and Gear Ratio Chart Find your tire size in the left most column and the gear ratios are across the top. The chart shows your estimated RPMs at 65 MPH assuming you are in 4th gear with a 1:1 ratio. Less Power / Better Gas Mileage Balanced Power / Gas Mileage More Power / Worse Gas Mileage   3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 26" 2580 2697 2782 2874 2983 3134 3286 3454 3588 3832 4101 4311 4445 4521 4798 27" 2484 2598 2679 2768 2873 3018 3164 3326 3455 3690 3949 4151 4281 4354 4621 28" 2396 2505 2583 2669 2770 2911 3051 3207 3332 3558 3808 4003 4128 4198 4456 29" 2313 2418 2494 2577 2675 2810 2946 3097 3217 3436 3677 3865 3986 4053 4302 30" 2236 2338 2411 2491 2585 2717 2848 2993 3110 3321 3554 3736 3853 3918 4159 31" 2164 2262 2333 2410 2502 2629 2756 2897 3009 3214 3439 3616 3728 3792 4024 32" 2096 2192 2260 2335 2424 2547 2670 2806 2915 3113 3332 3503 3612 3673 3899 33" 2033 2125 2192 2264 2350 2470 2589 2721 2827 3019 3231 3396 3502 3562 3781 34" 1973 2063 2127 2198 2281 2397 2513 2641 2744 2930 3136 3297 3399 3457 3669 35" 1916 2004 2066 2135 2216 2328 2441 2566 2666 2847 3046 3202 3302 3358 3564 36" 1863 1948 2009 2076 2155 2264 2373 2494 2592 2768 2962 3113 3211 3265 3465 37" 1813 1896 1955 2020 2096 2203 2309 2427 2521 2693 2882 3029 3124 3177 3372 38" 1765 1846 1903 1966 2041 2145 2248 2363 2455 2622 2806 2950 3042 3093 3283 39" 1720 1798 1854 1916 1989 2090 2190 2303 2392 2555 2734 2874 2964 3014 3199 40" 1677 1753 1808 1868 1939 2037 2136 2245 2332 2491 2666 2802 2890 2939 3119 41" 1636 1711 1764 1823 1892 1988 2084 2190 2275 2430 2601 2734 2819 2867 3043 42" 1597 1670 1722 1779 1847 1940 2034 2138 2221 2372 2539 2669 2752 2799 2970 43" 1560 1631 1682 1738 1804 1895 1987 2088 2170 2317 2480 2607 2688 2734 2901 44" 1524 1594 1644 1698 1763 1852 1942 2041 2120 2264 2423 2547 2627 2672 2835 Where did these numbers come from? All content Copyright © NakedJeep Jeep is a registered trademark of DaimlerChrysler.