Part of this power lies in the specially made SX heavy-duty chassis, which can withstand impact from hard landings. The 26x2.3" Chunder tires also help with making the SX Trail II able to go anywhere. The patented Cobra headtube, which Specialized promotes as unsurpassed in strength, contributes to the ruggedness of the SX Trail II. The Fox 36 Van RC2 fork also aids in the strength and versatility of this mountain bike. The Custom Avid Code 7 front and rear brake allow you to make tight stops when needed, in all environments. Like the other SX Trail bikes, the Specialized SX Trail II has the same A1 Premium Aluminum frame as the low-cost Specialized mountain bikes, but with a sophisticated geometry that emphasizes relaxed angles.