Motorcyclists 
Marc Marquez 
Joey Dunlop 
Valentino Rossi 
Michael Dunlop 
Casey Stoner
My 5 would be
Barry Sheene
Ron Haslam
John McGuiness
Guy Martin 
Mick Grant
Personally I could pick at least another 5
But if went for any powered 2 wheeled riders I would go for Bert Conneely,Steve Conneely, Darren Conneely, Stuart Day and Mike Bonnett
Thge above 5 are all current or ex racers in the BSSO (British Scooter Sport Organisation)
I'm being slightly biased with the Conneely brothers as there were all memebrs of the team I managed when we came 1st, 2nd, 3rd and 5th in the British Chamionship in 2014
Stuart Day is about to start his 34th season racing and has won just about every title goin and has only missed 3 meetings in this time 
Yes people may mock the idea of old Lambrettas and Vespas racing but they're surprisingly quick and above all it's great fun 
 
 Ours were geared for 115mph+ and these were only 210cc 
 
 