When I took delivery on my 35d, the dealer had already changed to the 20's.

I did keep the 18's though and am headed for a road trip to the mountains and wanted to put the 18s back on. I'd probably swap them back out as soon as I got back.

I've seen a lot of questions and discussion on the benefits of different tires, wheels, etc... but I haven't seen this one;

Is it as easy as jacking it up and swapping out the wheels?

It's not something I would be swapping out for an entire winter season, just for a week where I'll be likely to encounter winter conditions.

thanks in advance