Intermittant vibration at cruise

SR22 NA- About 3 months ago I started to feel a slight intermittent vibration when at cruise. I could time it and it would last 10 seconds and disappear. Over time this has grown to be 20-30 seconds at a time. Frequency has also been intermittent but the last two flights it has been consistent meaning vibrates for 20-30 seconds and then stops for 30 seconds. These are 2+ hour flights and it remained very consistent throughout even during descent.

We have checked cylinders, mags and spark plugs.

Any advise would be appreciated.

As you don’t metnion what the aircraft modle is…


Early pre beringer wheel aircraft have a problem with nose wheel bearing tension that is too loose…the tire has a tendency to rotate in flight and vibrate.

Rotation shall be 1 to 2 turns when “tossed”…

2016 G5

Have the nose wheel inspected. There have been instances of the internal balance weight of hte tire disbonding…and free floating in the tire/wheel assembly.