they did put a hold on sport bikes for a year but it was to move all of the previous years stock that they didn't sell. they then revised the models for this past year. the reason they discontinued the 450 was due to emissions regulations on ATV's as it turns out dirt bikes are considered closed course race vehicles and are not subject to the same restrictions that ATV's and cars are. so they had to pull the LTR off the market. I'm not sure why they didn't redesign and release a new 450 though.