Listed gear-ratio data for 2018 Mariner 175 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2018 Mariner 175 HP
Listed ratio values: 1.85:1, 1.87:1
| Model | Gear ratio |
|---|---|
| 175 OptiMax | 1.87:1 |
| F175 EFI V6 FourStroke | 1.85:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.