Danoff
Premium
- 34,058
- Mile High City
There's a decent chance that when the bike hits you it won't have the rider. In terms of momentum transferred to a particular body panel, you probably don't get to count the rider with the bike. He's gonna hit a different body panel, or miss the car, or go through the window, or he was already off the bike. If the rider's momentum gets distributed to a different (even just a little different) part of the car, it's not really comparable to a more solid object (like another car) hitting that particular part of the car.