This afternoon, I was in a minor collision with a longboarder. (The longboarder was on the road against traffic. I couldn't move out of the way as there was a car beside me.) It was a relatively low speed collision. No one was injured but the board struck my rear wheel. The wheel's now out of true, which wouldn't be a big deal, but there's also a small dent in the rim. Is it possible to safely straighten this dent or will I need to replace the rim?