1/32 & 1/24 Slot Car Gear Ratio Chart:

8 tooth pinion

                     36      37      38      39

Tire Size:

.785            5.73    5.89    6.05    6.21

.780            5.77    5.93    6.09    6.25

.775            5.81    5.97    6.13    6.29

.770            5.84    6.00    6.17    6.32

.765            5.88    6.04    6.21    6.36

.760            5.92    6.08    6.25    6.40

.755            5.96    6.12    6.29    6.44

9 tooth pinion 48 pitch gears I 64 pitch gears
                       29           30           31           32           35           36           37           38           39
Tire Size;
.875 (7/8)      3.68        3.81        3.94        4.06        4.44        4.57        4.70        4.83        4.95
.812 (13/16)  3.97        4.11        4.24        4.38        4.79        4.93        5.06        5.20        5.34
.800              4.03        4.17        4.30         4.45       4.86         5.00       5.14        5.28        5.42
.795              4.05        4.20        4.33         4.48       4.89         5.03       5.17        5.31        5.45
.790              4.08        4.23        4.36         4.50       4.92         5.06       5.20        5.34        5.49
.785              4.10        4.25        4.39         4.53       4.95         5.10       5.24        5.38        5.52
.780              4.13        4.27        4.42         4.56       4.99         5.13       5.27        5.41        5.55
.775              4.16        4.30        4.44         4.59       5.02         5.16       5.30        5.45        5.59
.770              4.18        4.32        4.47         4.62       5.05         5.19       5.34        5.48        5.63
.765              4.21        4.36        4.50         4.65       5.08         5.23       5.37        5.52        5.66
.760              4.24        4.39        4.53         4.68       5.12         5.26       5.41        5.56        5.70

10 tooth pinion
                         31              32            35           36           37           38           39           40           41
Tire Size;
.812 (13/16)    3.82           3.94         4.31        4.43        4.56        4.68        4.80        4.92        5.05
.800                3.88           4.00         4.38        4.50        4.63        4.75        4.88         5.00       5.13
.795                3.90           4.03         4.40        4.53        4.65        4.78        4.91         5.03       5.16
.790                3.92           4.05         4.43        4.52        4.68        4.81        4.94         5.06       5.19
.785                3.95           4.08         4.46        4.59        4.71        4.84        4.97         5.10       5.22
.780                3.97           4.10         4.49        4.62        4.74        4.87        5.00         5.13       5.26
.775                4.00           4.13         4.52        4.65        4.77        4.90        5.03         5.16       5.29
.770                4.03           4.16         4.55        4.68        4.81        4.94        5.06         5.19       5.32
.765                4.05           4.18         4.58        4.71        4.84        4.97        5.10         5.23       5.36
.760                4.08           4.21         4.60        4.74        4.87        5.00        5.13         5.26       5.39
.755                4.11           4.24         4.64        4.77        4.90        5.03        5.17         5.30       5.43

11 tooth pinion
                            36          37           38           39           40            41            42
Tire Size;
.812 (13/16)       4.03       4.14        4.25        4.37        4.48         4.59         4.70
.800                   4.09       4.20        4.32        4.43        4.55         4.66          4.77
.795                   4.12       4.23        4.35        4.46        4.57         4.69          4.80
.790                   4.14       4.26        4.37        4.49        4.60         4.72          4.83
.785                   4.17       4.28        4.40        4.52        4.63         4.75          4.86
.780                   4.20       4.31        4.43        4.55        4.66         4.78          4.90
.775                   4.22       4.34        4.46        4.57        4.69         4.81          4.93
.770                   4.25       4.37        4.49        4.60        4.72         4.84          4.96
.765                   4.28       4.39        4.52        4.63        4.75         4.87          4.99