Tires & Wheels X-UPHILL X-Maxx (MFT) (2)Louise X UPHILL X MAXX Tires FRONT & REAR Truck tires for the high performance Traxxas X MAXX. The new X UPHILL tire has the new incorporated MFT technology that is engineered to limit tire expansion (normally refered to as "balooning"). They are mounted on a new very sturdy black nylon 7 spoke wheels with a X Maxx specific 24 mm hex. The X UPHILL tire is a good allround tire for most rough surfaces including grass and hard packed clay! Micro Fiber