[monty1540]

We used the 8" A.M. mecanums last year, it was definitely a bumpy ride even with a 110 lb. robot. This year we're using the 6" A.M. mecanums and the ride quality is significantly better.

That said, we simply checked the tightness of the structural fasteners between every match last year and had no problems due to the vibration [not many problems at all - but that's both luck, and a different thread topic]. Use loctite and nylock nuts where you can, and check the other bolts frequently and you should be able to cope just fine with the vibration.

Another thing we noticed was that after hard use, the 8" wheels wore-in some, i.e. the hard corners on the rollers wore off to a rounder profile. It isn't perfect (still vibrates significantly) but they do wear-in after a while.