my bike has 4 k miles on it and it is now bottoming out and has pushed up the front tubes about one half inch what is the cause and what is the fix and should this happin to a bike with this level of milage

 

more information about the problem would be helpful. What model bike? What's bottoming where against what? What mods--if any--have you made? How much weight do you ride with when it bottoms, and how are you riding when it happens? The comment about 'pushed up the front tubes about 1/2"' sounds like you're saying the top of the fork tubes are now extending 1/2" further up through the tripple trees than they were originally? If that's the case, I'd not ride that bike again until you get to the root of this. Something (like your tripple trees) is loose.

 

That's gotta take a hellava jolt to push
the front tubes up. What are u Hauling?