What's up with those aluminum speed rocker spacers, what are they and can I use them. A spacer is the part that lives in the frame of the skate. It's not the axle that fits between the bearings in the wheel. It's the part that gets clamped to the bearings by the bolt that goes through the spacers and bearings.
Most skates come with a removable spacer.
The spacer has an oval shapethat fits into the frame towards the outside and a round shape that fits towards the inside. A hole is drilled in the spacer, offset from center of the oval that the bolt fits through. Turning two adjacent wheel spacers 180 degrees from each other creates a difference in height between the two wheels. You can use this difference in wheel height to create a rocker in the skate much like an ice hockey skate. What performance issues can I expect if I rocker my skates with your aluminum speed rocker spacers.