Boy, this is interesting...............

In trying to find out if the Ultimate is ringed...............

They list a ring in the parts list. But it's described as the ring for a .91FX. Honest! And the wrist pin is also described as for the .91FX. Since they also describe the engine as "very compact", I would assume that the sucker is what one could call "overbored". It appears to be a short stroke, "bored out" design.

very interesting