M109A3 30 MPH Bounce

[paulfarber]

A harmonic bounce is usually an out of balance item, typically a tire. Loose any tire chunks or lug nuts?

Do you know how much weight it will take to affect a tire as large and heavy as a mounted 9x20?

Low air pressure, bad toe in, uneven tread. OK. Out of balance on a low speed high wieght tire... not so much.

 

[Jimma]

I had that happen and it was low tire pressure.

 

[LowTech]

I can add more to this
The She Beast would do that between 30 - 35mph, then we changed the rims (to mod'd Hemmts) and tires (to 395's) which of course changes the speed-O to read slow by 15%. Now she does that bounce thing between 30 - 35mph on the speed-O, even though the ground speed is different.
Guess it's not the wheels and tires