hi guy i ha ve a question i have a ducati monster and has the rear rim is bended not bad and the tire has no problem holdin the air but would that little bend will affect the new tire in some way or should i get a new rim, i have been riding the bike like that with the old tired never had a problem thanks

If the rim holds air, I wouldn't do anything. If it won't hold air with a new tire on it, the easiest (and probably cheapest) thing to do is get the rim repaired. There are places that specialize in that sort of thing.

+1
have the wheel straightened. if it is bothering you.