Gear Ratio Guide for Larger Tires
Whenever
you change tire size from the original size to another there will be a direct
effect on power and drivability. We have developed this chart to help you
select the optimum gear ratio to put your performance back where you want it.
Using the chart below, first determine your original gear ratio and tire size
and follow to the intersection that should be your approximate RPM at 65 MPH.
Next find your new tire size and follow that across to the closest RPM to
your original and that will be first choice. If you are interested in a
change that will give more power or better fuel mileage use the color-coding
as a guide.
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|
Highway Driving, Good Fuel Economy
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|
|
Daily Driver, Best Overall Performance
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|
|
Most Power and Towing, Reduced Fuel
Economy
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This chart is based on 65 MPH and a gear ratio of 1:1, on a
manual transmission in 4th gear. Please NOTE: If you have an automatic
transmission your RPM will higher due to slippage in the transmission and the
torque converter. With an overdrive transmission your RPM in overdrive will
be 15% to 30% less than indicated.
|
|
2.35
|
2.73
|
2.94
|
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
|
6.17
|
7.17
|
|
22
|
2333
|
2710
|
2919
|
3048
|
3178
|
3286
|
3395
|
3524
|
3703
|
3882
|
4080
|
4239
|
4527
|
4845
|
5093
|
5252
|
5341
|
5668
|
6125
|
7118
|
|
23
|
2231
|
2592
|
2792
|
2915
|
3048
|
3143
|
3248
|
3371
|
3542
|
3713
|
3903
|
4055
|
4330
|
4634
|
4871
|
5023
|
5109
|
5422
|
5859
|
6808
|
|
24
|
2139
|
2484
|
2675
|
2794
|
2921
|
3012
|
3112
|
3231
|
3394
|
3558
|
3740
|
3886
|
4150
|
4441
|
4668
|
4814
|
4896
|
5196
|
5615
|
6525
|
|
25
|
2053
|
2385
|
2568
|
2682
|
2804
|
2892
|
2988
|
3101
|
3259
|
3416
|
3590
|
3730
|
3984
|
4263
|
4482
|
4621
|
4700
|
4988
|
5390
|
6264
|
|
26
|
1974
|
2293
|
2470
|
2579
|
2696
|
2780
|
2873
|
2982
|
3133
|
3284
|
3452
|
3587
|
3830
|
4099
|
4309
|
4444
|
4519
|
4796
|
5183
|
6023
|
|
27
|
1901
|
2208
|
2378
|
2483
|
2597
|
2677
|
2766
|
2872
|
3017
|
3163
|
3325
|
3454
|
3689
|
3947
|
4150
|
4279
|
4352
|
4619
|
4991
|
5800
|
|
28
|
1833
|
2129
|
2293
|
2395
|
2504
|
2582
|
2668
|
2769
|
2909
|
3050
|
3206
|
3331
|
3557
|
3806
|
4001
|
4126
|
4196
|
4454
|
4813
|
5593
|
|
29
|
1770
|
2056
|
2214
|
2312
|
2417
|
2493
|
2576
|
2674
|
2809
|
2945
|
3095
|
3216
|
3434
|
3675
|
3863
|
3984
|
4052
|
4300
|
4647
|
5400
|
|
30
|
1711
|
1987
|
2140
|
2235
|
2337
|
2410
|
2490
|
2584
|
2715
|
2846
|
2992
|
3109
|
3320
|
3553
|
3735
|
3851
|
3917
|
4157
|
4492
|
5220
|
|
31
|
1656
|
1923
|
2071
|
2163
|
2261
|
2332
|
2409
|
2501
|
2628
|
2755
|
2896
|
3008
|
3213
|
3438
|
3614
|
3727
|
3790
|
4023
|
4347
|
5051
|
|
32
|
1604
|
1863
|
2007
|
2095
|
2191
|
2259
|
2334
|
2423
|
2546
|
2669
|
2805
|
2914
|
3112
|
3331
|
3501
|
3610
|
3672
|
3897
|
4211
|
4894
|
|
33
|
1555
|
1807
|
1946
|
2032
|
2124
|
2191
|
2263
|
2349
|
2469
|
2588
|
2720
|
2826
|
3018
|
3230
|
3395
|
3501
|
3561
|
3779
|
4083
|
4745
|
|
34
|
1510
|
1754
|
1889
|
1972
|
2062
|
2126
|
2197
|
2280
|
2396
|
2512
|
2640
|
2743
|
2929
|
3135
|
3295
|
3398
|
3456
|
3668
|
3963
|
4606
|
|
35
|
1466
|
1704
|
1835
|
1916
|
2003
|
2065
|
2134
|
2215
|
2328
|
2440
|
2565
|
2664
|
2845
|
3045
|
3201
|
3301
|
3357
|
3563
|
3850
|
4474
|
|
36
|
1426
|
1656
|
1784
|
1862
|
1947
|
2008
|
2075
|
2154
|
2263
|
2372
|
2493
|
2590
|
2766
|
2961
|
3112
|
3209
|
3264
|
3464
|
3743
|
4350
|
|
37
|
1387
|
1611
|
1735
|
1812
|
1895
|
1954
|
2019
|
2095
|
2202
|
2308
|
2426
|
2520
|
2692
|
2881
|
3028
|
3123
|
3176
|
3370
|
3642
|
4232
|
|
38
|
1351
|
1569
|
1690
|
1764
|
1845
|
1902
|
1966
|
2040
|
2144
|
2247
|
2362
|
2454
|
2621
|
2805
|
2948
|
3040
|
3092
|
3282
|
3546
|
4121
|
|
39
|
1316
|
1529
|
1646
|
1719
|
1798
|
1854
|
1915
|
1988
|
2089
|
2190
|
2302
|
2391
|
2554
|
2733
|
2873
|
2962
|
3013
|
3198
|
3455
|
4015
|
|
40
|
1283
|
1491
|
1605
|
1676
|
1753
|
1807
|
1867
|
1938
|
2037
|
2135
|
2244
|
2331
|
2490
|
2664
|
2801
|
2888
|
2937
|
3118
|
3369
|
3915
|
|
41
|
1252
|
1454
|
1566
|
1635
|
1710
|
1763
|
1822
|
1891
|
1987
|
2083
|
2189
|
2275
|
2492
|
2599
|
2733
|
2818
|
2866
|
3042
|
3287
|
3819
|
|
42
|
1222
|
1420
|
1529
|
1596
|
1669
|
1721
|
1778
|
1846
|
1940
|
2033
|
2137
|
2220
|
2371
|
2538
|
2668
|
2751
|
2798
|
2969
|
3208
|
3728
|
|
43
|
1194
|
1387
|
1493
|
1559
|
1630
|
1681
|
1737
|
1803
|
1894
|
1986
|
2087
|
2169
|
2316
|
2479
|
2606
|
2687
|
2733
|
2900
|
3134
|
3642
|
|
44
|
1166
|
1355
|
1459
|
1524
|
1593
|
1643
|
1698
|
1762
|
1851
|
1941
|
2040
|
2119
|
2263
|
2422
|
2545
|
2626
|
2670
|
2834
|
3063
|
3559
|
|
