A nut from the UK is riding an old Raleigh Chopper over the entirety of the TdF course to raise money for a charity.  He's made it past stage 18, and had some help from Team Sky after stage 13 when his achilles tendon started acting up and his bike was having issues. Taken care of by the team doc and his little bike fixed up by pro mechanics. 

Good friend of mine had one of those when I was a kid and I was always jealous of how cool it was.  Riding it over alpine race stages? Not so jealous.

Link to his FB page: https://www.facebook.com/pages/Team-Chop/1536621486611591