Morning:
OK, here's a link that says M/C tires are duty free.
Click Here Scroll down to page 15, section 4011.40.00 00.
Now, here's what's involved:
I see they are $220 USD (if you want the 180 rear). That is roughly $286 Cdn. You will have to put 7% GST on top of that, so it's now $306 cdn. Then you will have probably a minimum of $40 USD ($52 CDN) in shipping, that brings your total to a minimum of $358 Cdn, if all goes smooth.
Now you have to go to a bike shop to have them put on. So that depends on your local shop, or if you want to try it yourself.
Personally, I can get the BT014 for ~$370 on the bike so I'll stick with the tried & true for me.