We’ve experienced a strange winter here…warm and lacking snow, so it felt odd preparing for another Arrowhead 135 race…a 135-mile ultrasport race that follows the scenic and hilly DNR-controlled Arrowhead snowmobile trail from International Falls, MN to Tower, MN.  Participants can run, ski, or bike the event.  Like most of the racers, I choose to ride my bike each year.    Tower has seen -60F temps in winters past, but there was no chance of that during the race this year.  The forecast called for above-zero-to-mid-twenties temps, snow, sleet, and freezing rain.  It’s tough to prepare for a lengthy spin through northern…