Racers used to be able to scrape their knee pucks if they knew what they were doing. Nowadays they can drag their shoulder and I even saw one guy who could have practically scraped his helmet! Tires have advanced so much in that time span from the to now! It's just incredible.
Once you have tried to follow a pro racer on the racetrack it can be a bit of an ego adjustment! I speak from experience from about 30 years ago. Wow, that's all I could manage to utter was WOW!