Skates U.S. advertised these rollerblade plates in Skate magazine recently. I was intrigued, so I went to their website:
https://skatesus.com/product/roll-line-linea/Very expensive - $500 plus mounting plates and boots. They come with a complete set of Wheels, Bearings, tools and professional toe stops as well as "Spacers." (?)
They have two interesting features:
Rockering System
By rotating the medial mechanism, it’s possible to obtain a different setting of the central wheel with the goal of replicate the same rockering used on the ice blades:
. Possibility to position the central wheel in a more rearward or frontward position.
. The wheel may be also moved up or down.
. Up to 6 different setting options.
Rear Wheel Positioning
The backward wheel can be placed in two different positions:
. The more internal housing is studied to place the rear wheel into a similar position of a traditional quad skate, just under the ankle bone.
. The more external housing is studied to place the rear wheel into a similar position of a traditional ice blade, posteriorly to the ankle bone.
Note: not available for sizes 8 and 8 1/2