Gear Ratio Chart/Pinion Gear Selection - Evader ST/BX With 87T
Spur |
|
|
|
|
|
|
Internal
Gear Ratio |
2.66 |
|
|
|
Off-Road
Tires |
Street Tires |
Foam Tires |
|
* Off-road calcs =
Gladiator II tires w/ 4.25" diameter |
|
|
Roll-out |
13.352 |
10.996 |
9.425 |
|
* Street calcs = Street
Hawg II tires w/ 3.5" diameter |
|
|
|
* Foam calcs = Generic
foam tires w/ 3.0" diameter |
|
|
Final Drive Ratios |
|
Pinion |
FDR (*:1) |
Pinion |
FDR (*:1) |
|
15 |
15.428 |
21 |
11.020 |
|
|
|
|
|
16 |
14.464 |
22 |
10.519 |
|
|
|
|
|
17 |
13.613 |
23 |
10.062 |
|
|
|
|
|
18 |
12.857 |
24 |
9.643 |
|
|
|
|
|
19 |
12.180 |
25 |
9.257 |
|
|
|
20 |
11.571 |
26 |
8.901 |
|
|
Efficiency Ratio1 |
|
|
|
|
Pinion |
FDR:RO - Off-Road |
Pinion |
FDR:RO -
Street |
Pinion |
FDR:RO - Foam |
|
|
|
15 |
1.156 |
15 |
1.403 |
15 |
1.637 |
|
|
|
16 |
1.083 |
16 |
1.315 |
16 |
1.535 |
|
17 |
1.020 |
17 |
1.238 |
17 |
1.444 |
|
18 |
0.963 |
18 |
1.169 |
18 |
1.364 |
|
19 |
0.912 |
19 |
1.108 |
19 |
1.292 |
|
20 |
0.867 |
20 |
1.052 |
20 |
1.228 |
|
21 |
0.825 |
21 |
1.002 |
21 |
1.169 |
|
22 |
0.788 |
22 |
0.957 |
22 |
1.116 |
|
23 |
0.754 |
23 |
0.915 |
23 |
1.068 |
|
24 |
0.722 |
24 |
0.877 |
24 |
1.023 |
|
25 |
0.693 |
25 |
0.842 |
25 |
0.982 |
|
26 |
0.667 |
26 |
0.809 |
26 |
0.944 |
|
|
1 Ideal Efficiency Ratio is closest to 1:1. Depending on the kV of your motor, you may
need to gear up or down to find the sweet spot. |
|
|
|
7 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|