Are you sure it wasn't doing it before you hit the kerb and you've only noticed now?
First thing to do would be to get the tracking checked as if you check it and it's ok, it shouldn't cost you anything.
You may have bent the steering arm or worse the wish bone but a garage doing the tracking should notice that. The new tyre may be an issue but i've found that having two different tyres with different tread patterns on the front normally causes a bit of a wobble
Finally yes you could have a sticky brake caliper on the side that it's pulling to so get them checked out
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