Listed gear-ratio data for 2005 Mariner 15 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2005 Mariner 15 HP
Listed ratio values: 2.00:1
| Model | Gear ratio |
|---|---|
| 15 TwoStroke | 2.00:1 |
| F15 FourStroke - early generation | 2.00:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.