I broke a spoke on my road bike once at the foot of a mountain on smooth pavement, I rode up (over gravel) and descending through gravel switchbacks on it and rode the remaining 25 miles home. I went to a local shop and got a new spoke, when I put it in the wheel was almost as straight as it was beforehand. Its not really a big deal, I wouldnt replace the wheel until 3 or 4 break.