So one link shows "75mph" while the other shows "120 Q". I don't know what "Q" stands for, but 75 mph happens to be equivalent to 120 kph.
Speed rating of "Q" is up to 99 MPH. Got that info from Big O, Tire Rack and Goodyear web sites.
http://www.goodyear.com/cfmx/web/gov/police/speed_ratings.cfm