Open tire, Gary, I have MG yellows on other karts and I love them but haven´t tried on the MGM. Again to my surprise I was faster on the narrow rear 6.0 instead of the 7.10s The other thing is sometimes I feel like I need more brakes, or at least I don´t feel themn right with this engine, either I block or they don´t bshow much at all. Maybe going to blue pads? What do you think? Thanks, Gary.