Normally, there are several ways to do this. One way is to do arcade mode and if you qualify in all races, you get the race car version of the class a, b, and c cars (if you have them).
Another way is to do 101 laps in Free Run Mode in every course. You will either get a class B or C car (I did this today and got the Nightmare and Saiyo). Good luck!
You have to go to the store and unlock the truck and bike sections for $0.99 each
Beat the first 30 cars in single races.
You need to wait until later in the game when you are in races against the special cars that you can unlock during the game (like the Logitech Racer and Elite Racer).
you can unlock it by beating rocket racer in the dome
Only if Speed Racer sponsors a race.
He has 73 pairs of socks
speed's last name was racer.
you should select hard
he is mainly a racer BUT he does do a lot of fighting with Dr.Eggman but he is not officially an actual racer using cars or any other motor vehicle but if u had to choose it would be mainly a racer but officially he is not a racer or a fighter
You Unlock it
You have to win them in races.
You must face all the challenges given by the creator to unlock all the legendary cars on cars.