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 13.35176878 10.99557429 9.424777961 * Street calcs = Street Hawg II or Road 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 11.02     FDR Starting Point Pinion
16 14.46375 22 10.51909091 Novak Velociti 6.5R 12.2-12.7:1 18-19**
17 13.61294118 23 10.06173913 Noval SS5800 12.3:1 18-19**
18 12.85666667 24 9.6425 Novak SS4300 12.5:1 18-19**
19 12.18 25 9.2568 **These are Novak's recommendations based on FDR
20 11.571 26 8.900769231
Efficiency Ratio1 1 Closest to 0.0 is ideal
Pinion FDR:RO - Off-Road Pinion FDR:RO - Street Pinion FDR:RO - Foam   - Positive numbers reflect overgearing
15 -2.076231222 15 -4.432425712 15 -6.003222039   - Negative numbers reflect undergearing
16 -1.111981222 16 -3.468175712 16 -5.038972039
17 -0.261172399 17 -2.617366889 17 -4.188163216
18 0.495102111 18 -1.861092379 18 -3.431888706
19 1.171768778 19 -1.184425712 19 -2.755222039
20 1.780768778 20 -0.575425712 20 -2.146222039
21 2.331768778 21 -0.024425712 21 -1.595222039
22 2.832677869 22 0.476483378 22 -1.094312948
23 3.290029647 23 0.933835157 23 -0.63696117
24 3.709268778 24 1.353074288 24 -0.217722039
25 4.094968778 25 1.738774288 25 0.167977961
26 4.450999547 26 2.094805057 26 0.52400873
Projected Top Speed (MPH)
P2K2 Pro Trinity D6 LRP V10 Spec 4 Orion Method R Novak SS4300 Novak SS5800 Mamba Max 5700 Novak Velociti 6.5
6-cell 7-cell 6-cell 7-cell 6-cell 7-cell 6-cell 7-cell 6-cell 7-cell 6-cell 7-cell 6-cell 7-cell 6-cell
Off-Road (17T) 27.31791 31.8709 33.60125 39.201 29.05848 33.90126 29.48945 34.40374 28.08696 32.76812 33.43685 39.00966 38.11801 44.47102 42.79917396
Street (21T) 27.79054 32.42229 34.18259 39.87921 29.56123 34.48778 29.99965 34.99896 28.57289 33.33504 34.01535 39.68457 38.7775 45.24041 43.5396441
Foam (24T) 27.22338 31.76062 33.48499 39.06535 28.95794 33.78395 29.38741 34.28469 27.98977 32.65473 33.32116 38.87468 37.98612 44.31714 42.65107994
** Trinity P2K2 Pro Stock 27T = 34,314 RPM @ 8.4V  29,412 RPM @ 7.2V (4,085 RPM/V)
** Trinity D6 12x2 = 42,206 RPM @ 8.4V  36,177 RPM @ 7.2V  (5,025 RPM/V)
** LRP V10 Spec 4 14x2 = 36,500 RPM @ 8.4V  31,286 RPM @ 7.2V  (4,345 RPM/V)
** Orion Method R 15x2 = 37,041 RPM @ 8.4V  31,750 RPM @ 7.2V  (4,410 RPM/V)
** Novak SS4300 = 35,280 RPM @ 8.4V  30,240 RPM @ 7.2V  (4,200 RPM/V)
** Novak SS5800 = 42,000 RPM @ 8.4V  36,000 RPM @ 7.2V  (5,000 RPM/V)
** Mamba Max 5700 = 47,880 RPM @ 8.4V  41,040 RPM @ 7.2V  (5,700 RPM/V)
** Novak Velociti 6.5 = 46,080 RPM @ 7.2V  (6,400 RPM/V)