Re: Which mecanum wheels to buy?
 

I have noticed the same thing. The outer rollers on the new AndyMark wheels touch the ground during the transition from one roller to the next. When we compared our old wheels to the new ones we could feel the big difference that the extra rollers had simply by rolling them across a table.

Re: Which mecanum wheels to buy?
 

Were those these 8" wheels or a different set?

We used the 6" VexPro ones this year and our bot was shaking quite a bit.

Re: Which mecanum wheels to buy?
 

VEX Mecanum wheels are work decently, but I've heard (and seen) 6 inch Andy Mark work pretty well. If quality isn't as much as an issue, and your just playing around with the wheels, maybe you could 3D print wheels? It's a bit time consuming, but if your team has a 3D printer and it's for experimental purposes, it might be something to consider. Also, it will be cheaper :D

If your interested, message me and I can send you a file.

Re: Which mecanum wheels to buy?
 

Those were the wheels we used this year. For us they replaced these wheels which we used in past years.