The framework features additional holes allowing to move the whole suspension system more ahead to extend the wheelbase regarding the car. The framework features 3 wheelbase modification positions. The entire backward place is identical to the initial X1 chassis wheelbase. One other two extra roles runs the wheelbase for the automobile by 4 and 8mm. The longer the wheelbase is, the car is more stable and better to drive. However longer wheelbase decreases car reaction, rotation and steering. Shorter wheelbase is advised for smaller technical tracks and longer for more available tracks. The 2.5mm framework & top deck are produced from good quality graphite product.