J'ai un pneu crevé. OR J'ai une crevaison. That means it happened by accident. But if you mean you did it to someone one you dislike (not that I would, but the way you phrased it makes me think of it), it would be J'ai crevé ses pneus.
August 3, 2014
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J'ai crevé.
August 3, 2014
0
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J'ai crevé un pneu.
If you did it to someone, you'd possibly say: J'ai crevé un de ses pneus"
August 4, 2014
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0
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