Fifteen motorcyclists have died and a further 164 have been seriously injured in crashes across Sussex this year.
The latest death was on Tuesday at Horsted Keynes when an unnamed 20-year-old biker died in a crash with a car, Sussex Police said.
Officers said they were concerned at the figures and committed to reducing the number of injuries and deaths.
It follows a bank holiday crackdown in which police targeted a small minority of bikers behaving irresponsibly.
Insp Phil Nicholas said that more than 100 motorcyclists were stopped, 30 fixed penalty notices were issued, and 73 riders were advised about their manner of riding during the weekend.
Offences reported included speeding, illegal exhausts, and illegally fixed number plates.
Police seized one bike at the roadside.
Insp Nicholas said: "We saw examples of a small number of individuals taking unacceptable risks at high speeds.
"The message is clear, we will continue to target those who put their own lives and others at risk by the manner of their riding and their disregard for the law."