My first fixed gear was a schwinn world sport and I made the same mistake you are about to do. $120 is just the beginning of what you are about to spend. Next comes a wheelset in 700cc, a crankset, BB, cog, lockring, long reach brake, and then extras if you want new tires, saddle, etc. You are buying only the frame and spending too much for a schwinn (which is very heavy). You could buy a real track frame from bikeisland.com for that much and you will be happier later. Or even better, buy a used trackbike off ebay for less than the total of what I listed above and be even more happy. Pay more now and u pay less overall, or pay less now and get nickle/dimed to death later.