I have not hit a deer on my bike but a deer has hit me. I was broad sided by a good size doe as I was descending a hill at about 20mph. She pushed me from the center of the lane to the gravel shoulder. I was able to slow down enough and unclip by the time I hit the gravel to not crash. Ms. doe pulled her front leg out of my now trashed rear wheel and scampered off leaving only bits of fur in the spokes. Fortunately I was headed home and had only a few mile walk (in road cleats). Rear wheel was fixable.