Givi Tnh1203 Upper Engine Guards Honda Nx500 Designed for the on and off-road enthusiast, the Givi Upper Crash Bars give a more rugged and aggressive look as well as offering better overall protection for those unforeseen mishaps. The bolts onto Lower Engine Guards to fully fortify your bike. Made from one inch tubing, the Givi Crash Bars are a great addition for the serious motorcycle enthusiast. Tubing is 1 in diameter. Note: Givi recommends fitting by a qualified mechanic.