I finally broke down and bought a fat bike in December and have had a great time riding the trails and streets this winter. This is my first attempt at winter riding. It helped that this is an El Nino year but I still went out at -20 C/-5F if the wind wasn't too strong. I find that there is a bit more effort required with the fat tires but I know that when spring finally gets here I won't need a break in period for my butt or legs. It just takes a bit longer to get dressed before going out. For the record I turn 70 next month and I am no way a hard core cyclist.