As an urban commuter, I had always solved this issue by riding my bike to work, but being unable to store my bike inside my apartment had led to a lot of problems (to the point where I felt like we needed to hang a sign like the one to the left outside of our apartment). In one instance, the bolt on my front tire was stolen, and I actually rode all of the way to work without it, only realizing the bolt was missing once I reached the train station. Obviously, this was pretty dangerous, since my entire front tire could have fallen off my bike during the ride, and I felt that I needed a better solution.
While trying to replace stolen components from my bike I visited Trophy Bikes, where a really helpful mechanic suggested Pitlocks, which are bolts with customized keys to prevent theft. I was interested until I found out that the price tag was about $90, which was probably worth more than my actual bike. It definitely would have solved some of my problems, but I was hesitant to spent this money on a bike that I was forced to leave outside uncovered (and was already generating some rust). After mentioning this to the mechanic, he pointed out a foldable bike that they carried called a Brompton. For those of you that are not familiar, these bikes are wonderful, but very pricey, and usually cost upwards of $2,000. My grad school budget has no room for splurging, but I was hooked on the idea of a folding bicycle, which could be stored indoors, would prevent theft, and could even be taken on a train!
I looked around for a few months, and I thought that maybe I could find a great deal on a used Brompton or Dahon on Craigslist, but there were very few located in the area, and most were out of my price range. Finally, I stumbled upon Citizen Bike, which offers a range of foldable models, with prices between $169 (16" wheels and steel frame) and $399 (20" wheels and alloy frame). Another theft (this time of my bicycle seat) forced the issue and I donated what was left of my bike the day after purchasing a Citizen Miami online. I've had the Citizen Miami- which my coworkers have affectionately named 'Matilda'- for a week now, and I'm very impressed.
In the interest of full disclosure, I'm by no means a bike connoisseur. In addition to Matilda, I own a used Specialized Hardrock for mountain biking, which I purchased only after another bike mechanic seemed legitimately concerned that I might break the frame of my Huffy on the trails at Wissahickon Park. Matilda offers a smooth ride, and with 20" tires and a steel frame, weighs about 30 pounds. She folds nicely in 3 quick moves, and while I was secretly worried that the bike would look ridiculous, I've gotten a few compliments already. My favorite was one by a clear Philly native who shouted "Yo, that jawn is TIGHTTT!" Best of all, she only set me back $269, and fits nicely under my desk.

My next post will be a "Sustainability Spotlight", focusing on a company that has set the standard on incorporating environmental consciousness into their operations. See you soon!