The fastest Matchbox cars are very much defined by their wheels. If you are looking for fast Matchbox cars, the vast majority are going to be represented by cars with specific wheels. 7 wheel types represented 46 of my 50 fastest Matchbox cars.
Here is an example of the shiny disc wheels from the Laser Wheels series released in 1987 featuring 30 models. And on the right the same casting from the Superfast series (with 24 models) featuring the Starburst wheels. Both of these are important series with many elite level cars. Important to note that these cars are just so-so without graphite, but with dry lubes they really come to life.