NSR Extreme Grip Ultimate MG Vanquish slot car Tyres 21 x 14. These NSR Extreme Grip slot car race tires are for MG Vanquish slot cars, NSR & Slot.It MG Vanquish wheels 16 x 13. Please ! note that NSR Extreme slot car tires MUST be glued on to your wheels to keep in place due to the softness and Extreme traction / Grip they offer. If truing your Extreme tyres, extra care and time should be observed.