50's: any bike with Fausto's butt imprints.
60's: any bike with Jaques' butt imprints. (Anquetil...)
70's: any bike with Eddie's butt imprints.
80's: any bike with Greg's butt imprints (call me Jingoistic...)
90's: Big Mig's butt imprints.
00's: ah, y'all can guess.

Geez, that was harder than I thought it would be.