Flatiron Spinning Ratios
| Whorl | Large Groove | Small Groove |
|---|---|---|
| Extra Slow | 4.6:1 | 5.2:1 |
| Slow | 6.8:1 | 8.5:1 |
| Medium | 10.4:1 | 12.4:1 |
| Fast | 15:1 | 17.4:1 |
| High | 20:1 | 25.2:1 |
| Super High | 21.2:1 | 26.1:1 |
| Whorl | Large Groove | Small Groove |
|---|---|---|
| Extra Slow | 4.6:1 | 5.2:1 |
| Slow | 6.8:1 | 8.5:1 |
| Medium | 10.4:1 | 12.4:1 |
| Fast | 15:1 | 17.4:1 |
| High | 20:1 | 25.2:1 |
| Super High | 21.2:1 | 26.1:1 |