The "4 K for Cancer" started in Maryland at the end of May and will end up in Portland this Saturday.
Kevin Cocran did the ride a couple years ago and decided to do it again this year.
"A big reason was I really felt powerless in college to affect change in a tangible way. I have a lot of cancer in my family, my uncle, grandfather, dad ... all had cancer. And this was a great way for me to get involved and make a tangible difference on my own.
Each biker raised at least four thosuand dollars to help young adults dealing with cancer.
There are three of these "4 K for Cancer" rides this year and collectively they are raising half a million dollars.