Bike culture is as deeply ingrained in Seattle’s identity as coffee and Birkenstocks. But with our rainy weather and hilly terrain, Seattle — at least on paper — should’ve never become the biking haven that it is today. That’s the unlikely history that Tom Fucoloro, founder of the Seattle Bike Blog and author of “Biking Uphill in the Rain: The Story of Seattle from Behind the Handlebars," set out to explore.