As a believer in the idea of natural selection, I've avoided writing a "winter riding tips" blog now for 4 years. But since I'm still seeing a good number of people riding bikes in the winter without good equipment, I'm breaking my vow of silence to address some basic safety issues in the name of keeping bikes on the road year round. Hopefully this doesn't come as a surprise to you, but car drivers don't expect to see bicyclists this time of year. Whether you're in California and it's a frigid 58F or here in Minnesota and it's a balmy…