apparently I don't have one. but the cold takes it's toll in so many ways. I dial back performance expectations & strive for time in the saddle as opposed to miles, max speed & higher avrg speeds. if the roads are terrible & dangerous that's more of a factor for road riding. last year I explored lots of hard surfaced off road trails & that was really fun. was able to easily get 2 - 4 hrs of outdoor exercise w ea trip