I don't know what kind of bird this is. Wing span of about 30 inches. Its not a big Red Tail or anything similar. I routinely ride my bike west of town on a series of hills. Usually coming back I'm moving 30 to 35 mph. This bird goes right over my head. Judging from the size of the shadow and the sharpness on the pavement this guy is getting really close. Today he flew over me 5 times. I started zig zagging like a ship in sub waters and that seemed to knock him off. A couple of years ago I saw him about a half mile off just circling and riding the thermals. He saw me and immediately went for me in the classic attack course. Do hawks see in color? My helmet is white and I'm wondering if I changed the color of my helmet that might get this bird to leave me alone.

Should get a helmet that looks like this

That's not going to help. There are three things this animal could be going for with this behavior. It wants to feed, mate, or drive off due to territorial concerns. I'm not interested in any of these.

Cant ID the bird but its protecting its territory. I have a pair of Red Wing Blackbirds that nest every year in a small tree near my townhouse. They dive bomb me repeatedly when I walk to the mailbox.

A faint possibility is that it’s a released or escaped falconry bird. Yes, they can see color.
It does sound like a territory thing, though.
Get in touch with your local hawkers and see if someone wants to bring along some bait and watch the behavior - or at least give them the location so they can check it out. You could check with the DNR as well.

Not only do they see in color, they see all the way into the ultraviolet spectrum.

It's why they can see prey that is very well camouflaged to predator mammals.

Hawks are not known to nest low enough to defend a nest from ground dwellers. More than likely it was an owl.

Redwing blackbirds will do that.

I was out on my front porch yesterday afternoon about 6:00 PM when I saw a huge bird flying through the trees in my front yard. I saw it land and went and got my binoculars. Turns out it was a large barn owl. I love having owls around and hear them often at night. I couldn't get a good picture but hope to if he/she comes back.