Fo'sho'! Do you know what happens to a bicycle tire at 60 mph, much less 120? How about a wheel? Have you considered the forces put on a bicycle frame if you hit the slightest bump at 120 mph?
Also, Did you do your homework and find that a pulse jet large enough to propel a bicycle and rider to 120 is nearly impossible to mount to a bicycle- and what about the huge fuel supply needed?
If anyone is going 120 with a pulsejet on a bicycle, don't you think they would provide some evidence?