| Gear Ratio Chart/Pinion Gear Selection - Stampede 87T Spur | |||||||||||
| Internal Gear Ratio | 2.72 | ||||||||||
| Roll-out | 15.70796 | * Calculations made using Moab tires w/ 5" outer diameter | |||||||||
| Final Drive Ratios | |||||||||||
| Pinion | FDR (*:1) | Pinion | FDR (*:1) | ||||||||
| 15 | 15.776 | 21 | 11.26857143 | ||||||||
| 16 | 14.79 | 22 | 10.75636364 | ||||||||
| 17 | 13.92 | 23 | 10.28869565 | ||||||||
| 18 | 13.14666667 | 24 | 9.86 | ||||||||
| 19 | 12.45473684 | 25 | 9.4656 | ||||||||
| 20 | 11.832 | 26 | 9.101538462 | ||||||||
| Efficiency Ratio1 | 1 Closest to 0.0 is ideal | ||||||||||
| Pinion | FDR:RO | - Positive numbers reflect overgearing | |||||||||
| 15 | -2.424231222 | - Negative numbers reflect undergearing | |||||||||
| 16 | -1.438231222 | ||||||||||
| 17 | -0.568231222 | ||||||||||
| 18 | 0.205102111 | ||||||||||
| 19 | 0.897031936 | ||||||||||
| 20 | 1.519768778 | ||||||||||
| 21 | 2.083197349 | ||||||||||
| 22 | 2.595405141 | ||||||||||
| 23 | 3.063073126 | ||||||||||
| 24 | 3.491768778 | ||||||||||
| 25 | 3.886168778 | ||||||||||
| 26 | 4.250230316 | ||||||||||
| Projected Top Speed (MPH) | |||||||||||
| Havok | V10 Spec 4 | SS5800 | |||||||||
| 6-cell | 7-cell | 6-cell | 7-cell | 6-cell | 7-cell | ||||||
| 33.80528 | 39.43896 | 33.43234 | 39.00404 | 38.46974 | 44.88136 | ||||||
| ** Orion Havok 15x2 = 36,907 RPM @ 8.4V 31,635 RPM @ 7.2V (4,397 RPM/V) | |||||||||||
| ** LRP V10 Spec 4 14x2 = 36,500 RPM @ 8.4V 31,286 RPM @ 7.2V (4,345 RPM/V) | |||||||||||
| ** Novak SS5800 = 42,000 RPM @ 8.4V 36,000 RPM @ 7.2V (5,000 RPM/V) | |||||||||||