| Share | Phrase |
|---|
| 16.37% | ride smoothness |
| 16.08% | running smoothness |
| 15.11% | running [time periodicity] smoothness |
| 14.65% | running [time periodicity] smoothness |
| 9.70% | engine smoothness |
| 9.52% | improve smoothness [perform operation] |
| 4.57% | operation smoothness |
| 3.54% | affect smoothness [perform operation] |
| 3.24% | surface smoothness |
| 3.02% | determine smoothness [perform operation] |
| 2.15% | maintain smoothness [perform operation] |
| 2.00% | high [size] smoothness |