It's not fixed/ss, but most of the people I know still riding in this cold are. Please keep your eyes out for this:
"My bright yellow schwinn tandem bicycle was stolen in south philly last night. As it will be rare to see someone with a yellow vintage tandem, please let me know if you see it around, etc. Reward for the person that finds it! You will turn this frown upside down....please repost. thanks"