Help creating a bicycle jump

Ok so i need assistance in creating a bicycle jump. what i have in my scene is 2 ramps and a bicycle. in max i created a box that was constrained to move along a spline with keyframes. unity did not see that as an animation. what is the easiest way to get the bicycle smoothly over the 2 ramps. i am not using this in fps. this is from a side shot so the bicycle will have to be automated. i could manually do every single point to make it smooth but im sure there is something to do with physix to make the bike just be pushed up the ramp and then let gravity take over or something.

figured out how to addforce for a few seconds then cut the force off so i would slow down and land on ramp.

ok so i got the bike to jump and it goes over the two ramps and lands, but it move a little unnatural. what physics component am i looking for to be able to get the bike to shift in the air so that when it goes up it leans back just a little with the nose up some. and when it starts to comeback down level out and then have nose lean down more.