I wasn't a devotee of the Seinfeld show. Then again, I don't think I've ever been a devotee of any TV show in a very long time.
However, I will admit that I saw a few episodes of Seinfeld during its original run. One thing I remember is that he always had a bicycle--which neither he nor anyone else seemed to ride--hanging in his apartment.
I was reminded of it when I saw this bike:
As I recall, the bike in Seinfeld's apartment was a Klein mountain bike--in a really scary fluorescent green that makes the bike in the photo seem restrained. Actually, this bike is probably the most understated Klein mountain bike I've ever seen.
Although they weren't my cup of tea, some Klein road bikes, like this one, weren't bad-looking:
In the mid-1970's, Klein was one of the first builders to make bicycle frames from oversized aluminum tubing. Trek took them over around the time Seinfeld's show began its run. It seems that Trek made Kleins until about five years ago. Since then, I haven't seen any new Kleins--or, for whatever reasons, the shops I frequent aren't selling them.