I average about 2 a year. Times 35 years, that is around 70 flat tires since age 18. It's gotten worse lately. I have 3 plugs in the rear tire on my VN750, and it's only halfway worn out. That's 3 flats in one tire in 10,000 miles. For some reason, 9 out of 10 flats seem to be the rear tire. That's why I have considered a Sportster with a cast rear wheel and spoke front wheel.