The frame has a 4130 Cr Mo construction that not only ensures the utmost reliability but provides enough flex to absorb vibrations from the trail. It has been custom-butted & machined, giving it strength in all the desired places & material has been removed to save weight in non-critical areas. Also, it's intended for use with 26" wheels, providing taller or older dirt jump riders with a stable riding platform to throw your style down at the local spots.