About 1,500 riders hit the streets to pedal in the fight against cancer.

It's the two-day Dolphins Cycle Challenge where teams raise money for cancer research and treatment. In addition, it supports the Sylvester Comprehensive Cancer Center.

Many of those riding are doing so in the memory of Miami Dolphin great Jim "Mad Dog" Mandich. He passed away of bile duct cancer, at 62. 

"I think about [my Dad] often, it keeps driving me to make it better, grow this event in stature and size, and it has," said Michael Mandich.

The Dolphins Cycling Challenge has raised $1.6 million in 2 years and now, they're hoping to get that number up to $2 million by the end of the challenge.

There are a series of one-day, 30 mile rides, and a 170-mile two-day ride that will take cyclists to Palm Beach County.

For more information about the different routes, and how to donate, click here.