Listed gear-ratio data for 2021 Mercury 500 HP SeaPro V12 outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2021 Mercury 500 HP SeaPro V12
Listed ratio values: 2.50:1
| Model | Gear ratio |
|---|---|
| 3B060047-UP | 2.50:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.