[dentist90]

I spoke to an agent at Border Services and he also spoke to a colleague at Transport Canada and there is no issue with the tires as long as they are clean and DOT approved. As I am having to use a customs broker, they are playing it by the book and the Fuchs are subject to 6% duty because they do not fall under NAFTA (German made), plus GST and PST on the lot. Plus brokerage fees. Plus the shipping.
The real concern arose when the Customs agent said he couldn't say whether or not they would be flagged for inspection, ie: to search for contraband that might be hidden inside the mounted tires. If there is no x-ray equipment at the entrance point they migt be dismounted to inspect. That would be just too much to pay for re-balancing them.
Bringing them across personally is a much better way to go, so I have enlisted my brother in law to do just that for me.
Shipping them "by the book" is just too expensive.
Carrying them over in person is much simpler, but they're 1000 miles away.