Truvativ was late to the game in bringing a top-end bash guard to market but it seems like they at least spent their time wisely in studying what works and what doesn't. The Truvativ Rock Guard is built from bulletproof polycarbonate composite that can take a serious beating and the backside is heavily relieved for an impressively light weight. Co-molded aluminium inserts at the 104mm bolt circle diameter mounting holes let you really crank down those chainring bolts for a truly bomber setup.