The smartest thing you can do is to reduce the size as far as you can from 21. Seeing you are in TO all-weather tires ( with the snow flake)will probably suffice if you do not venture to fat out of the GTA. Check with 1010tire or other co for fitting choices. It will pay off to have both summer and winter wheels . Being all weather your tires can run in either spring or fall a little longer so as to save the expensive 21" tires.....Hi guys, I live in Toronto and bought my 19.5 RRS HST this summer, I have the 21' all-season tires from the factory and I wonder if it's necessary to buy those expensive winter tires. After all, this is a range rover, I have high expectation on its winter accessibility. Cheers!