[Oblarg]

Originally Posted by Ether

Could you please give more detail about what you mean by performance and quality in this context?

In my experience, 6'' wheels run smoother (less vibration) and track straighter while strafing (in the absence of a gyro).

We also had several defective 8'' mecanum plates, and one of the backup wheels we purchased was so deformed that not a single roller could turn since they were all in contact with their neighbors. They're also heavier, and the rollers jam far more often.

I've had no quality problems with the 6'' models, ever, nor any major issues with their performance since 2008 (when the plate was flimsy and required constant maintenance to keep it from bending in on the rollers).