After my MTB got stolen when I moved to Philadelphia, I decided that I'd get a three speed commuter bike, complete with fenders, rack, and basket. Well, I found all of this in a cheap little package at Performance Bikes: the 2010 Schwinn Coffee cruiser. It rides like velvet, its super cheap (came in at around 215$ after discounts and coupons so I won't be heartbroke if it gets stolen), and it comes with fenders, rack, and chain guard. The biggest issue is that it's a single speed. I tend to ride fast, and with the single speed I eventually hit a point where my cadence just isn't pushing me faster.
After research, I found out that they also released the same model with 3 speeds. What would be the process of converting from a single speed to a 3 speed? Is it possible? I've never really done any bike modding so this will be a first for me. I'm not looking for the ability to climb mountains or go scary fast, but I'd like a low and high gear (or high and higher) compared to what I have now.