AS someone that can't ride for about 5-6 months of the year and NEED to winterize because temps get to -20°F let me give some answers.
I dont do anything with the tires, lift or put something under them, I just let them be on the concrete garage floor.
They will not develop flat spots. Their made out of rubber, rubber is flexible. They will go back to their round self.
There are times in the spring and fall when the bike might sit for 2-3 weeks because of weather, I dont use a tender those times and I have not had any battery problems. I take my battery inside the house in the winter so that it is not sitting in the extreme cold and the about once a month put a tender on it for a few days.
Also fuel stabilizer cant hurt at any time.
I use Seafoam and add it in even in the summer time to keep everyting working fine. Never had any problems.
If your only sitting for 2-3 weeks - nope you dont need it, BUT add it if you wish. It can only help and not hurt anything.
So in the winter I put in Seafoam, fill the tank, put a dab of oil on the exhaust ends ( keep mice out), and put a cover of the bike and wait for spring! You can do more, but that's all that is needed.
Must be terrible riding all year!
Last edited by jdock; 09-30-2019 at 12:23 PM.