Listed gear-ratio data for 2009 Mariner 275 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2009 Mariner 275 HP
Listed ratio values: 1.85:1
| Model | Gear ratio |
|---|---|
| Verado 275 L6 | 1.85:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.