Listed gear-ratio data for 2005 Mercury 100 HP 4-Cylinder 2-Stroke outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2005 Mercury 100 HP 4-Cylinder 2-Stroke
Listed ratio values: 2.07:1, 2.31:1
| Model | Gear ratio |
|---|---|
| 0B209468-0G760299 | 2.07:1, 2.31:1 |
| 0G760300-UP | 2.07:1, 2.31:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.