Running different tires makes/brands on front and rear these days with radials isn't as bad as it used to be with the old belted and bias-ply tires, but it still isn't what they were designed to work with. If I had a freebie to throw on and it was different, I still would, but I would take it easy for a bit before I pushed them, to see if they had any wierd/different characteristics or anything.
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