48mmオムニホイール（サーボおよびLEGO Mindstorms NXT対応）

the lego attachment was hard to assemble but worked fine after that

good product, exactly what I expected

We are using omniwheels since many years. These are really good. The rubber is smooth enough to provide a good grip, and finally one of the most critical problems (how to fix wheels to motor axis) is smoothly solved for different kind of axes, including some of the most common for this dimension of wheels. A third coupling (the "half moon" one) would solve this problem also for more "professional" micromotors, but with the provided ones it is relatively easy to arrange coupling also for them.

Rolls smoother than expected, especially for the low price.

I use it as a tail wheel on my Lego robot. My robot turns on a dime (one wheel turning forward, the other backwards) and the Omniwheel performs extremely well in this situation.