my 2c:
Unless you are new to Canada/US and haven't quite learned yet, there is really no excuse to use tyre. It is not used over here.
To me it is like the people who call soccer football (futball?); you sound like an idiot over here.
Growing up I was taught Z as zee, and now re-learning it as zed is often difficult when spelling things out loud. I often catch myself about to say zee. Obviously everyone knows what I mean when I say zee (one difference from the soccer example, but similar to tire) but it is not correct, so I try not to use it.
__________________
|