The part of the motorcycle most susceptible to failure is the nut connecting the handlebars to the seat. Given any particular motorcycle, this part is replaceable. However, it is usually not replaced until after failure.
Helmet laws merely delay Darwinism. I fully support an individual's right to be stupid...it eventually makes more room for the rest of us.
2012 R1200GS Rallye Edition, 2013 Ducati Hypermotard SP, 2013 Honda NC700X DCT, 1990 Honda GB500 TT
AMA, IBA, MSTA, BMWMOA, Ducatista, MSF RiderCoach, Track Coach, OEM Demo Team Manager